Question

Find the surface area of the cone in terms of π.

180π cm2


108π cm2


144π cm2


90π cm2

Answer 1

`54\pi \: {cm}^(2)`

Explanation:

Given:

A cone

l = 15 cm

r (radius) = 3 cm

Find: A (surface area) - ?

`a(surface) = \pi {r}^(2) + \pi * r * l`

`a(surface) = \pi * {3}^(2) + \pi * 3 * 15 = 9\pi + 45\pi = 54\pi \: {cm}^(2)`