Question

A triangular pyramid has four congruent equilateral triangle faces. Each edge of the pyramid is 6 inches. Find the surface area of the pyramid round to the nearest hundredth.

Answer 1

check the picture below.

if each side of every triangular face is 6 units, then the triangular face is an equilateral triangle.

now, that in the picture is the area of one of the faces, there are 4 faces, thus the surface area of the triangular pyramid is 4*A.