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

Question

asked Apr 8, 2020 20.2k views

2 Answers

Masako · Answer 1 · 2020-04-13T12:32:36+0000

Answer: THE LAST OPTION

Explanation:

The formula for calcualte the surface area of a cone is the shown below:

$SA=rs\pi+r^(2)\pi$

Where s is the slant height and r is the radius.

You can see in the figure that s=21ft and the r=12ft.

Then when you substitute values, you obtain that the result is:

$SA=(12ft)(21ft)\pi+(12ft)^(2)\pi=396\pi$ ft²