Question

What is the area of a circle with the circumference of `8pi`?

Answer 1

I found `16pi`

Explanation:

Consider that the circumferece is given as:
`C=2pir`
So using your data we get:
`8cancel(pi)=2cancel(pi)r`
So that: `r=8/2=4`
The area is given by:
`A=pir^2`
And so using the value for the radius found before:
`A=pi4^2=16pi~~50.3`