Formula for right triangular prism surface area

From the net, you can see that that the surface area of the entire prism equals the sum of the figures that make up the net: Total surface area = area A + area B + area C + area D + area E + area F. Using the formula for the area of a rectangle, you can see that the area of rectangle A is: A = l · wA = 10 · 5 = 50 square units.

Formula for right triangular prism surface area. Triangular prisms showmeTotal surface area of a triangular prism Volume and surface area of triangular prisms (black and white) (e)Prism triangular surface area right angled isosceles volume find work prisms math problems triangle rectangular rectangle problem example lateral sa. 12 Best Images of Finding Volume Of Prism Worksheets - Cubes Volume

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Example 1: Find the lateral surface area of a regular pentagonal prism if the perimeter of the base = 270 inches and height = 75 inches. Solution: The lateral surface area of pentagonal prism is, L = Ph, where P is the perimeter of the base and h is the height of the prism Here, P = 270 in, h = 75 in ⇒ LSA = Ph = (270)×(75) = 20,250 sq. inches. Answer: Therefore, the lateral surface area of ...Find the area of each face. Add up all areas. SA = 2B + 2πrh S A = 2 B + 2 π r h. Find the area of the base, times 2, then add the areas to the areas of the rectangle, which is the circumference times the height. SA = 4πr2 S A = 4 π r 2. Find the area of the great circle and multiply it by 4.To calculate the surface area of the triangular prism, calculate the area of each face and then add them together. The surface area of the prism is the sum of the areas. Add the area of the triangular base twice, since it appears twice in the prism: 32.5+50+32.5+21+21=157 \mathrm {~mm}^2 32.5 + 50 + 32.5 + 21 + 21 = 157 mm2.The formula to calculate the surface area of a right triangular prism is given as S1 × h + (S1 + S2 + h) L. Here, 'h' is the height of the base triangle, S1 is the base edge, S2 is the hypotenuse and L is the base length of the prism as shown in the figure. Let us take an example to find the surface area of a right triangular prism.Triangular Prisms. This ensemble of surface area of a triangular prism printable worksheets is packed with learning! Focussing on triangular prisms, this set of free pdfs requires students to find the surface area by adding up the areas of three rectangular faces and two parallel triangular bases. Alternatively, you use the formula SA = bh + (s ...Triangular Prism Volume Formula. The volume of a triangular prism can be found by multiplying the base times the height. Both of the pictures of the Triangular prisms below illustrate the same formula. The formula, in general, is the area of the base (the red triangle in the picture on the left) times the height, h. The right hand picture ... The measure of the total surface area occupied by the triangular based prism is defined as the surface area of a triangular prism. The surface area is normally measured in square units. The surface area of a triangular prism formula uses the values of base, height, sides and prism height to determine the SA of the triangle prism. If you think ...

Bobbie is carving out its own piece of an infant formula market poised to be a valued at $103 billion by 2026. Organic infant formula company Bobbie is taking a hint from its stagg...Surface Area of a Triangular Prism. s = 1/2(a + b + c) Base SA = s (s - a) (s - b) (s - c)) Lateral SA = h × (a + b + c) You can also use our triangle calculator to find the base surface area using several different methods. This tool is helpful when all sides are not known.To find the radius, r, of a cylinder from its surface area A, you must also know the cylinder's height, h:. Substitute the height h into the surface area of a cylinder equation:. A = 2πr² + 2πrh. Bring all terms in this equation to one side to get 2πr² + 2πrh - A = 0.Note that this is a quadratic equation in terms of r.. Solve this equation using the …Here we are discussing about prism formulas for right prim. Triangular Prism formulas. A Prism having two parallel triangular surfaces, one rectangular base and two rectangular surfaces are inclined to each other then is is called triangular prism. Lateral surface area of the triangular prism = Perimeter of triangle x l = (a + b + c) lThe ratio of the surface area, S, to the volume, V, can be expressed as a fraction S/V, or converted to a decimal. In order to find the ratio of the surface area to the volume, we have to first find the surface area of the prism and the volume of the prism.

PayPal laid off dozens of employees from its San Jose headquarters, filings show. As first reported by The Information and later confirmed by Techcrunch, the layoffs impacted 83 em...The lateral surface area of a rectangular prism formula is: Below is a rectangular prism surface area example showing how to find both lateral surface area and total surface area. Example. ... The area of the right face is found by multiplying width and height to get 4 × 9 = 36. Since these areas only represent half of the area, we multiply by ...• rectangular prism • net • triangular prism • right prism • surface area • cylinder Key Words You can use a Verbal Visual Chart (VVC) to help you learn and remember new terms. Copy the blank VVC into your math journal or notebook and use it for the term, rectangular prism. • Write the term in the fi rst box.For a right triangular prism, this includes the areas of the two triangular ends and the three rectangular sides. The surface area of a geometric shape is simply the sum of the areas of all its faces. When you put these faces together, you form the prism's surface. The other three faces, which are rectangles, connect these triangles.

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Welcome to How to Find the Surface Area of a Rectangular Prism with Mr. J! Need help with finding the surface area of a rectangular prism? You're in the righ...Example 1: Find the Surface Area of the Right-Angled Triangular Prism Above. Let’s begin with the triangular faces. Both faces have the same area because …So that's going to be 40 plus six. So times 46 centimeters. That's this blue area. So that's gonna be 460 square centimeters, 460 square centimeters. And now we just have to figure out the area of the two flaps. So this flap right over here is 20 centimeters by three centimeters, so that's 60 centimeters squared.The total surface area of a rectangular prism is 96 ft2 with a base area of 12 ft2 and the perimeter of the base being 18 ft. Determine its height of the rectangular prism. Solution: Base Area = Top Area = lb = 12 ft 2. Perimeter = 2 (l + b) = 18 ft. T.S.A = 96 ft 2. 2lb + 2h (l + b) = 96. 2 12 + 18 h = 96. 24 + 18h = 96.

The surface Area of the prism is 540 square centimeters. Step-by-step explanation: Given: Base side = 5 cm. Base side = 13 cm. Base side = 12 cm. Height of the prism = 16 cm. We need to find the surface area of the prism. Solution: Now we know that; Given prism is a right angled triangular prism. The formula for Surface area of triangular prism ...Formulas work for all the prisms. The faces of prisms will be recognizable polygons, so let's review the area formulas for the basic polygons: Try it! Here is a triangular prism: Total surface area of a triangular prism example. The area of each triangle is 1 2 b h \frac{1}{2}bh 2 1 bh:Given that its base area is 2,928.9 square decimeters and its base perimeter is 275 decimeters, compute for the total surface area of the terrarium to identify how much glass is needed to build it.Surface Area = 2(pi r 2) + (2 pi r)* h In words, the easiest way is to think of a can. The surface area is the areas of all the parts needed to cover the can. That's the top, the bottom, and the paper label that wraps around the middle. You can find the area of the top (or the bottom). That's the formula for area of a circle (pi r 2). Since ...In this lesson we show how to calculate the Total Surface Area of Rectangular and Triangular Prisms, including Cylinders, as well as the TSA of Pyramids. TSA of Rectangular Prisms. One method of calculating the TSA (Total Surface Area) is to "unfold" a 3D shape, into its flat "2D" net which the shape is made from.The total surface area of a rectangular prism is 96 ft2 with a base area of 12 ft2 and the perimeter of the base being 18 ft. Determine its height of the rectangular prism. Solution: Base Area = Top Area = lb = 12 ft 2. Perimeter = 2 (l + b) = 18 ft. T.S.A = 96 ft 2. 2lb + 2h (l + b) = 96. 2 12 + 18 h = 96. 24 + 18h = 96.Example: find the volume of a prism; Practical applications Volume of a triangular prism formula. The volume formula for a triangular prism is (height x base x length) / 2, as seen in the figure below: So, you need to know just three measures: height, base, and length, in order to calculate the volume. How to calculate the volume of a ...For a right triangular prism, where one of the bases is a right-angled triangle, the formula for the total surface area is given by: Total Surface Area (TSA) = (b × h) + (s 1 + s 2 + s 3 ) L Here, s 1 , s 2 , and s 3 are the edges of the triangular base, (h) is the height of the base triangle, (l) is the length of the prism, and (b) is the ...Surface area of a cylinder: A = 2πr² + 2πrh, where r is the radius and h is the height of the cylinder. Surface area of a cone: A = πr² + πr√(r² + h²), where r is the radius and h is the height of the cone. Surface area of a rectangular prism (box): A = 2(ab + bc + ac), where a, b and c are the lengths of three sides of the cuboid.Surface area of a right prism. Try this Change the height and dimensions of the triangular prism by dragging the orange dots. Note how the surface area is calculated. A right prism is composed of a set of flat surfaces. The two base are congruent polygons . The lateral faces (or sides) are rectangles . The total surface area is the sum of these.

The formula is: Volume (V) = 1 3 B h, here B = base area, h = height. Let us solve some examples involving the above formula. Find the volume of a regular triangular pyramid with a base area of 97 cm2 and a height of 26 cm. Solution: As we know, Volume ( V) = 1 3 B h, here B = 97 cm 2, h = 26 cm. ∴ V = 1 3 × 97 × 26. = 840.6 cm 3.

Here we are discussing about prism formulas for right prim. Triangular Prism formulas. A Prism having two parallel triangular surfaces, one rectangular base and two rectangular surfaces are inclined to each other then is is called triangular prism. Lateral surface area of the triangular prism = Perimeter of triangle x l = (a + b + c) lIt has 5 faces and 9 edges. Use our online surface area of a triangular prism calculator to efficiently calculate the total surface area occupied by the triangular based prism. Enter the triangle's sides, base, height, and prism height in the prism calculator to find the SA of the triangular prism. Triangle Base (b)L→ length of the prism. Surface Area of Triangular prism formula, The surface area of triangular prism=Lateral Area +2 times the triangular base area. A→ P*H+2 times A. S.A→ the surface area of the prism. A→ Area of the base. P→ the perimeter of the base. H→ height of the prism. Area of triangle Formula, A=1/2 *b*h. …Solution: a = 4 in, b = 5 in. c = 3 in, l = 10 in. Right Triangular Prism. Total Surface Area. The area covered by all the faces of a right triangular prism represents the total surface area. Total surface area = (a + b + c) × l + b × h.The formula for the surface area of a pentagonal prism is: Surface Area = (5ab + 5bh) square units. Pentagonal Prism Volume. The volume of a pentagonal prism gives the capacity of the prism. The formula for the volume of a pentagonal prism is: Volume = (5/2 × abh) cubic units. Example: If the apothem length 'a' of a pentagonal prism is 5 feet ...The steps to determine the base area of the prism, if the volume of the prism is given, are: Step 1: Write the given dimensions of the prism. Step 2: Substitute the given values in the formula V = B × H where "V", "B", and "H" are the volume, base area, and height of the prism. Step 3: Now solve the equation for "B".Here is the formula for the surface area of a triangular prism. Surface area of a triangular prism = bh + (a + b + c)H. Let's see what each term refers to: 'a', 'b', and 'c' are the side lengths of the triangular bases. 'b' and 'h' are the base and height of the triangular faces. H is the height of the triangular prism. Rapid Recall.Popular BitTorrent tracker Demonoid is back online, upgrades are in the works for Google Video chat, and an interactive concept surface displays the New York Times with beams of li...Calculate the rectangular prism surface area. First rectangle area is 15in × 12in = 180in², second 15in × 18in = 270in² and third one 18in × 12in = 216in². Add all three rectangles' areas - it's equal to 666 in² ( what a number!) - and finally multiply by 2. The surface area of our cardboard box is 1332in². Or save yourself some time ...

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In the formula for finding the surface area of a triangular prism, the variables represent the following: a) P represents the Perimeter of the base. b) H represents the Height of the prism. c) B represents the Area of the base. In summary, P represents the perimeter of the base, H represents the height of the prism, and B represents the area of ...The surface area of a triangular prism can be calculated by adding the base area and its lateral faces. The formula to calculate the surface area of a triangular prism is. SA = 2B + P h. Where. B is the area of a triangle. P is the perimeter of the base. h is the height of the prism. Learn how to use the surface area of a triangular prism ...Prism Surface Area Practice Sheets - Draw nets to find surface area of rectangular prisms, cubes, and triangular prisms with these TWO practice worksheets. Can be used as a follow up to teaching nets of prisms and an introduction to discovering the formula for finding surface area. Use them as a class practice assignment, independent homework ...The formula to calculate the TSA of a triangular prism is given below: Total Surface Area (TSA) = (b × h) + (s1 + s2 + s3) × l, here, s1, s2, and s3 are the base edges, h = height, l = length. Let us solve some examples to understand the concept better. Find the surface area of a triangular prism with a triangular base of 7 cm, 6 cm, and 4 cm ...Height (h) The height of the prism. Lateral Surface Area (LSA) The lateral surface area is the area of the lateral faces of the Prism. Total Surface Area (TSA) The total surface area of the Prism is the sum of the lateral surface area and the area of the two bases. Hexagonal Prism Surface Area Calculator. You can calculate the lateral surface ...This calculator calculates the surface area of a trapezoidal prism using sides of trapezoid, altitude, height values. The length of the four rectangles will be the sum of the four sides of the trapezoid, the two bases, and the other two sides. The surface area can be given with this formula: Surface Area of Trapezoidal Prism S=a (l + h) + b (l ...Find the surface area of a pentagonal prism with a base edge of 11 cm and height 6 cm. Solution: As we know, Total Surface Area ( TSA) = 5 b h + 1 2 5 ( 5 + 2 5) b 2 , here b = 11 cm, h = 6 cm. ∴ TSA = 5 × 11 × 7 + 1 2 5 ( 5 + 2 5) × 11 2. = 801.35 cm 2. What is the surface area of a pentagonal prism. Learn how to find it with formulas ...Find the surface area of a triangular prism having parallel surfaces as right triangles with base 4 cm and height 3 cm. The height of the prism is 10 cm and the slant height is 5 cm. 4.The total area of these shapes is called the surface area of the object. It gives some idea of how large an object is, but now how much space it takes up. This is measured by volume, which we will discuss next. Watch this lecture series and complete the interactive exercises to practice calculating the surface area of rectangular prisms.The oceans take up most of the surface area of our planet and remain mostly unexplored. But how many oceans are there? Advertisement Planet Earth, when viewed from space, has been ...Examples on Square Prism. Example 1: If the length of the side of the square face of a square prism is 4 inches and its height is 10 inches, find its surface area and volume. Solution: Given: side of the square prism, a = 4 inches; height of a square prism, h = 10 inches; Using the square prism formula: ….

In this lesson we show how to calculate the Total Surface Area of Rectangular and Triangular Prisms, including Cylinders, as well as the TSA of Pyramids. TSA of Rectangular Prisms. One method of calculating the TSA (Total Surface Area) is to "unfold" a 3D shape, into its flat "2D" net which the shape is made from.The area of the right face is also 20 square inches. 7. Add the six areas together. Now you've found the area of each of the six faces. Add them all together to get the area of the whole shape: lw + lw + wh + wh + lh + lh. You can use this formula for any rectangular prism, and you will always get the surface area.Find the surface area of triangular prism. The dimension of base is 9.9 by 6.2 and the distance between bases is 14.6. Find the surface area of the rectangular prism. How do you find the area of a trapezoid without the height? Use a formula to find the surface area of each polyhedron described.A triangular prism when divided has five faces, two triangular and three rectangular faces. A regular triangular prism has 9 edges. It will make 5 faces. It will make 6 vertices. The properties will change for irregular or semiregular polygons. Surface Area of a Triangular Prism Formula . Surface area is the total space available outside of an ...The surface area of a right triangular prism can be calculated by representing the 3-d figure into a 2-d net, which makes it easier to understand. How to Find the Surface Area of a Right Triangular Prism?Ī right triangular prism has two parallel and congruent triangular faces and three rectangular faces that are perpendicular to the triangular ...A triangular prism is a geometric solid shape with a triangle as its base. It's a three-sided prism where the base and top are equal triangles and the remaining 3 sides are rectangles. This calculator finds the volume, surface area and height of a triangular prism. Surface area calculations include top, bottom, lateral sides and total surface area.Step 3: Find the area of the rectangular sides by multiplying the perimeter of a base triangle by the length of the prism: A = ( b 1 + b 2 + b 3) l . A = ( b 1 + b 2 + b 3) l = 78 cm. ⋅ 31 cm ...Research shows that aid tends to flow to places that hold the relatively rich instead of poorer ones. The role of aid in Africa has been a controversial issue over the years, with ...Popular BitTorrent tracker Demonoid is back online, upgrades are in the works for Google Video chat, and an interactive concept surface displays the New York Times with beams of li...Prism Surface Area Practice Sheets - Draw nets to find surface area of rectangular prisms, cubes, and triangular prisms with these TWO practice worksheets. Can be used as a follow up to teaching nets of prisms and an introduction to discovering the formula for finding surface area. Use them as a class practice assignment, independent homework ... Formula for right triangular prism surface area, Then, the surface area of the hexagonal prism is. SA = 2(93.6) + 36(20) = 907.2 in2 S A = 2 ( 93.6) + 36 ( 20) = 907.2 in 2. To find the volume of the right hexagonal prism, we multiply the area of the base by the height using the formula V = Bh. V = B h. The base is 93.6 cm2, 93.6 cm 2, and the height is 20 cm cm. , Find the total area of a regular triangular prism with a side of 8cm and a length of 10cm. example 2:ex 2: Find the volume of a regular triangular prism with a base area of 12cm 2 and a lateral area of 18cm 2. example 3:ex 3: Find the side of a regular triangular prism if the volume is $ 12 \sqrt {3} $ and length of 4cm., We cannot prove this formula rigorously at this stage, because the proof involves constructing the cylinder as a limit of prisms. If the base circle of the cylinder has radius r, then we know that the area of the circle is. A = π r2. If the height of the cylinder is h, then its volume is. Volume = π r2 × h = π r2h., Here are the steps to compute the surface area of a triangular prism: 1. Find the areas of each of the three rectangular faces, using the formula for the area of a rectangle: length x width. 2. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. 3., The formula for the surface area of a right triangular prism is calculated by adding up the area of all rectangular and triangular faces of a prism. The surface area of a right triangular prism formula is: Surface area = (Length × Perimeter) + (2 × Base Area) = ((S)1 + (S)2 + h)L + bh. Let’s break down this formula:, Here are the steps to compute the surface area of a triangular prism: 1. Find the areas of each of the three rectangular faces, using the formula for the area of a …, Lateral Surface Area = 12(8) = 96 inches2 = 12 ( 8) = 96 inches 2. The general formula for the total surface area of a right prism is T.S.A.= ph+2B T. S. A. = p h + 2 B where p p represents the perimeter of the base, h h the height of the prism and B B the area of the base. There is no easy way to calculate the surface area of an oblique prism ..., Title. surface-area-tri-prism-formula. Created Date. 9/7/2017 1:07:03 PM., The formula for the surface area of a triangular prism is obtained by adding the expressions for the areas of all the faces of the prism. In a triangular prism, we have two equal triangular faces and three rectangular faces that may or may not be the same. Each triangular face has an area of \frac {1} {2} ab 21ab, where a is the length of the ..., The base area of the triangular prism is represented by base_area. The a, b and c letters are the respective sides of the triangle. While the length is, you guessed it, the prism's length.Īrea = Length * (a + b + c) + (2 * base_area) Volume = 0.5 * b * h * length b is the length of the triangle's base. The most basic two equations are as ..., The volume of a solid object is the amount of air it encloses inside its surfaces. The volume of prism formula can be calculated using the following equation. Volume of a Prism = (Area of the Base Polygon)(Height of the Prism) Volume = 12 × A × h. Let us take the example of a triangular prism and calculate its volume using the above formula., Right Prism And Oblique Prism. Apart from regular and irregular, the prism can be classified into two more types; ... The surface area of the prism is the total area covered by the faces of the prism. For any kind of prism, the surface area can be found using the formula; ... Example 1: Find the volume of a triangular prism whose area is 60 cm ..., So, the surface area would be: SA = Perimeter * height + 2 * Area of base triangle = (4+3+5) * 6 + 2 * (0.5 * 4 * 3) = 72 + 12 = 84 square units. This formula applies regardless of the size of the right triangular prism, you just need to replace the values with your specific measurements., The figure presents a surface net of a rectangular prism. The net consists of 4 rectangles in a row, where the second rectangle from the left is also connected to a rectangle above it and a rectangle below it. The bottom of the left most rectangle is labeled as 3 units. The bottom of the second rectangle from the left is labeled as 2 units., shahupayal102. The approximate surface area of the prism is 337 square feet. The surface area of the prism in the image can be found by calculating the areas of each of its faces, and then adding all the areas up. There are two triangles, a rectangle, and a square. The area of a triangle is equal to ½bh, where b is the base and h is the height., Jul 29, 2017 · This basic geometry video tutorial explains how to find the volume and surface area of a triangular prism. It explains how to derive the formulas in additio... , 3996. What is the surface area? 5920. What is the surface area? 588. What is the surface area? 790. What is the surface area? 384., Step 1: Create a net for the triangular prism by "cutting" two edges of the triangular faces and unfolding. Step 2: Find the area of each triangle. Find the area of the rectangle. Step 3: Add all ..., The surface area of the prism is 735 cm 2. Since the bases of a triangular prism are congruent, we can say: Surface area sum of the areas of the 3 rectangular faces 2 area of one triangular base 75 2 1 2 75 2 1 2 4.4 Surface Area of a Right Triangular Prism 189 Connect The area measurements are approximate because the measurements are given to, The total surface area of a triangular prism is equal to the sum of twice the base area and thrice the product of a triangular base with the prism’s length. Formula. A = bh + 3bl. where, b is the triangular base, h is the altitude of triangular base, l …, The total surface area of a triangular prism formula involves summing up the areas of all its rectangular and triangular faces. To better understand the dimensions used in this formula, take a look at the illustration of a triangular prism provided below. The total surface area of a triangular prism formula can be expressed as follows:, It composes the required formula in the run time after gathering the values and that is why it is safe to say that it is also a surface area of a triangular pyramid formula calculator. Triangular Pyramid. Area of the base (A) = ½ * a * s. Surface Area of Pyramid = A + ((3/2) sl) Volume of Pyramid = (1/6) abh. Where, a = apothem length; s ..., Area of the front face = (1/2) x 4 x 3 = 6 sq.cm. Area of the back face = (1/2) x 4 x 3 = 6 sq.cm. So, surface area = sum of the area of 5 faces. surface area = 28 + 21 + 35 + 6 + 6. Surface area of the triangular prism = 96 sq.cm. Let us look at the next problem on "Surface area of 3d shapes". Problem 4 :, The lateral surface area of a triangular prism = (a + b +c)H square units. where, a, b, c are sides of triangular base. H is height of triangular prism. We know that the general formula for the total surface area of a right prism is T. S. A. = PH+2A, where P is the base perimeter, A is the base area, and H is the height of the prism., The formula for the surface area of a right triangular prism is calculated by adding up the area of all rectangular and triangular faces of a prism. The surface area of a right triangular prism formula is: Surface area = (Length × Perimeter) + (2 × Base Area) = ( (S)1 + (S)2 + h)L + bh. Let’s break down this formula:, It composes the required formula in the run time after gathering the values and that is why it is safe to say that it is also a surface area of a triangular pyramid formula calculator. Triangular Pyramid. Area of the base (A) = ½ * a * s. Surface Area of Pyramid = A + ((3/2) sl) Volume of Pyramid = (1/6) abh. Where, a = apothem length; s ..., The formula to friendship. Steven Strogatz in The New York Times answers the question of why your Facebook friends always seem to have more friends than you. In a colossal study of..., The rectangular faces are known as the lateral faces and the triangular faces are the bases of the prism. The surface area of a triangular prism is calculated by adding up the area of the lateral faces and the triangular bases. Here is the formula for the surface area of a triangular prism. Surface area of a triangular prism = bh + (a + b + c)H , A rectangular prism made up of unit cubes. The front face of the rectangular prism has 10 cubes: 2 rows and 5 columns. Starting from left to right, the colors of 2 cubes in each column are: blue, pink, green, purple, and red. The top face of the rectangular prism has 20 cubes: 4 rows and 5 columns., Then, the surface area of the hexagonal prism is. SA = 2(93.6) + 36(20) = 907.2 in2 S A = 2 ( 93.6) + 36 ( 20) = 907.2 in 2. To find the volume of the right hexagonal prism, we multiply the area of the base by the height using the formula V = Bh. V = B h. The base is 93.6 cm2, 93.6 cm 2, and the height is 20 cm cm. , The formula to calculate the total and lateral surface area of a triangular prism is given below: Lateral Surface Area (LSA) = (s1 + s2 + s3) × l, here, s1, s2, and s3 are …, Example 1: surface area of a rectangular prism. Calculate the surface area of the rectangular prism. Calculate the area of each face. The area of the bottom is 9 \times 3=27 \, cm^2.. The top face is the same as the bottom face, so the area of the top is also 27 \, cm^2.. The area of the front is 9 \times 4=36 \, cm^2.. The back face is the same as the front face, so the area of the back is ..., The area of the right face is also 20 square inches. 7. Add the six areas together. Now you've found the area of each of the six faces. Add them all together to get the area of the whole shape: lw + lw + wh + wh + lh + lh. You can use this formula for any rectangular prism, and you will always get the surface area.