Question

How do you find the radius of a circle with a circumference of 12pi

Answer 1

6

Explanation:

The circumference of a circle is
`2\pir`
`\pi r`, so
`12\pi=2\pi r\\12=2r\\r=6`. We can use this because the area of a circle is
`\pi r^2`. Thus,
`\pi*6^2=36\pi`.