Question

What is the circumference of a circle whose area is `16pi`?

Answer 1

`8pi`

Explanation:

The circumference of a circle is `2pir` and the area of a circle is given by `pir^2`
`pir^2 = 16pi`
`:. r = sqrt(16) = 4`
Circumference `=2pir = 2pi*4 =8pi`