![]() 8 To finish our example, just add up all the blue numbers above: 12 + 12 + 15 + 15 + 20 + 20 94 square inches. You can use this formula for any rectangular prism, and you will always get the surface area. The measurements on the triangular prism are in mm therefore the total surface area of the triangular prism 144mm2 144mm2. Add them all together to get the area of the whole shape: lw + lw + wh + wh + lh + lh. For example, if you are starting with mm and you know r and h in mm, your calculations will result with V in mm 3 and S in mm 2.īelow are the standard formulas for surface area. 24+24+24+32+40144 24 +24 +24 +32 +40 144. The units are in place to give an indication of the order of the results such as ft, ft 2 or ft 3. Units: Note that units are shown for convenience but do not affect the calculations. ![]() Online calculator to calculate the surface area of geometric solids including a capsule, cone, frustum, cube, cylinder, hemisphere, pyramid, rectangular prism, sphere, spherical cap, and triangular prism Triangular Prism Calculator Calculator Use
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