Question

The height of a side on a pyramid is 11 inches long, and its square base has sides that are 6 inches long. What is the surface area?

168 in. 2
144 in. 2
233 in. 2
207 in. 2

Answer 1

Each triangular face has area 1/2 · base · slant height = 1/2 · 6 · 11 = 33 in^2.
Four faces: 4 · 33 = 132 in^2.
Plus base area 6^2 = 36 in^2 gives total surface area 132 + 36 = 168 in^2.

Answer: 168 in^2.