Surface Area of Prisms — Quiz

Question 8 • Grade 7 Mathematics

Which equation can be used to calculate the surface area of the triangular prism net shown? Expand Image

Answer

Surface Area is equal to 2 times 5 times 13 plus 5 times 10 plus 13 times 10 plus 12 times 10

Surface Area is equal to 1 half times 5 times 12 plus 1 half times 5 times 12 plus 5 times 10 plus 12 times 10 plus 13 times 10

Surface Area is equal to 1 half times 5 times 13 plus 1 half times 5 times 13 plus 5 times 10 plus 13 times 10 plus 12 times 10

Surface Area is equal to 1 half times 5 times 12 plus 5 times 10 plus 12 times 10 plus 13 times 10

Explanation

A triangular prism has two triangular bases and three rectangular side faces. The triangle is a right triangle with legs 5 and 12, so each base has area 1/2 × 5 × 12. The rectangles have dimensions 5 × 10, 12 × 10, and 13 × 10, so choice B adds all five face areas.

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