Question

The circumference of a circle is 22 pi in. What is the area, in square inches?

Answer 1

`121\pi` square inches.

Explanation:

First of all we need the radius. You know that the length of a circumference is
`2\pi r = 22\pi\ in` . We can easily find the radius, which is
`11 in`. At this point it's simply squaring it and multiplying it by
`\pi`:
`A = \pi r^2 = \pi (11)^2 in^2 = 121\pi in^2`