Question

What is the surface area of the right cone below

Answer 1

I'm pretty sure the answer is D

Answer 2

D) Surface area of cone =
`54 *\pi` units² .

Explanation:

Given : A cone of slant height 15 units and radius 3 units.

To find : What is the surface area of the right cone.

Solution : We have given that

Slant height ( l) = 15 units.

Radius = 3 units.

Surface area of cone =
`\pi* radius ( radius + slant height )`.

Surface area of cone =
`\pi* 3 (3 + 15 )`.

Surface area of cone =
`\pi* 3 (18)`.

Surface area of cone =
`\pi* 54` units² .

Therefore, D) Surface area of cone =
`54 *\pi` units² .