Question

How do you find the circumference and the area of a circle with radius is 4 feet?

Answer 1

The circumference is `8pi`
The area is `16pi`

Explanation:

The formula for circumference is `2pir`, so `2*pi*r` is `2*4*pi`, or `8pi`.
The formula for area is `pir^2`, so `pi*r*r` is `16pi`.