Question

What is the total surface area of the square pyramid? A square pyramid. The square base has side lengths of 8 inches. The triangular sides have a height of 5 inches. __________ square inches 20 40 104 144

Answer 1

D. 144

Explanation:

Explanation:

4 triangles + square

4(½ × 8 × 5) + 8²

4(20) + 64

80 + 64

144 in²

took test on edge 2021 got 100%

Answer 2

9514 1404 393

Answer:

144 square inches

Explanation:

The total surface area is the sum of the areas of the square base and the four triangular faces. Using b for the base length and h for the triangle height, the area is ...

SA = b² +4(1/2)bh = b(b +2h)

For the base of 8 inches and the height of 5 inches, the total area is ...

SA = (8 in)(8 in + 2·5 in) = 8·18 in²

SA = 144 in²