Intermediate Test Prep Math 8 (Grade 7) Surface Area of a Triangular Prism Lesson

To find the surface area of a right triangular prism we must use this formula:

SA = wh + lw + lh + ls

The variables in this formula stand for:

w = width
h = height
l = length
s = side

Let's put this formula to use.

You can use a calculator to help.

Find the surface area of this right triangular prism. Dimensions are in feet.

SA = wh + lw + lh + ls

SA = 5(6)+9(5)+9(6)+9(7)

SA = 30+45+54+63

SA = 192 ft²

Here's another one.

Find the surface area of this right triangular prism. Dimensions are in inches.

SA = wh + lw + lh + ls

SA = 6.9(7.5)+12.3(6.9)
+12.3(7.5)+12.3(9.7)

SA = 51.75+84.87+
92.25+119.31

SA = 348.15 sq in

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