Question

A triangular pyramid has a base with an area of 21.8 square meters and lateral faces with bases of 7.1 meters and heights of 13 meters enter an expression that can be used to the surface area of the triangular pyramid?

Answer 1

21.8

Explanation:

Answer 2

21.8 + (3/2)(7.1)(13)

Explanation:

The surface area (SA) is the sum of the base area (B) and lateral area (LA). The lateral area is the sum of the areas of the three face triangles.

SA = B + LA

LA = 3((1/2)bh)) . . . . b is the base length of the triangle, and h is its height

Using appropriate substitutions, we have ...

SA = 21.8 + (3/2)(7.1)(13)