Question

how do I find the surface area of a square pyramid if the length is 11mm and the slant height is 13mm?

Answer 1

407mm²

Explanation:

the triangle face is 1/2(11)(13) = 71.5

there are 4 triangle faces so 71.5 x 4 = 286

plus the bottom, 11 * 11 = 121

286+121=407mm²