Answer:
The answer is below
Step-by-step explanation:
A triangular pyramid is a pyramid with a triangular base. It is a polyhedron (3 dimensional shape) composed of four triangular faces, six straight edges, and four vertex corners.
The surface area of a triangular pyramid with congruent equilateral triangles = 4 * area of one triangle
Area of one triangle = (1/2) * base * height = (1/2) * 15 in * 13 in = 97.5 in²
Surface area of pyramid = 4 * 97.5 in² = 390 in²
