Question

1.

Find the surface area of the right cone.
Round your answer to the nearest
hundredth.
22 ft
8 ft

Answer 1

789.40 square feet (to nearest hundredth)

Explanation:

surface area = area of circular base + curved surface area

= πr² + πrL, where L is length of sloped edge.

using Pythagoras' Theorem, L² = 22² + 8² = 548.

L = 2√137 (do not round the answer yet, keep it in this form).

surface area = πr² + πrL

= π(8)² + π(8)(2√137)

= 789.40 square feet (to nearest hundredth)