Question

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

Answer 1

your answer is D the last option

Explanation:

Answer 2

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