Question

The area of a circle is 4π ft². What is the circumference, in feet? Express your answer in terms of \piπ.

Answer 1

C = 4 pi ft

Explanation:

The area of a circle is given by

A = pi r^2

Solving for r

4 pi = pi r^2

Dividing each side by pi

4 = r^2

Taking the square root of each side

sqrt(4) = sqrt(r^2)

2 = r

Now we can find the circumference

C = 2 * pi *r

C = 2*pi*2

C = 4 pi ft