Question

A toy pyramid has the dimensions shown below. The base of the pyramid is an equilateral triangle. What is the surface area of this pyramid?

136 cm 2
64 cm 2
272 cm 2
100 cm 2

Please help 20 points.

Answer 1

136 cm^2

Explanation:

The formula for the surface area of a pyramid is SA = B + 1/2Pl, where B stands for the area of the base, P stands for the perimeter (of the base), and l stands for the slant height.

The perimeter of the triangle is three sides that are equal because this is an equilateral triangle. The base of a triangle is 1/2 base times height.

SA = B + 1/2Pl

SA = 1/2(8*7) + 1/2(8+8+8)(9)

SA = 136 cm^2