Question

The circumference of a circle is 4pi. Find its radius, in feet.

Answer 1

Answer: 2

Explanation:

The circumference of a circle is 2*radius*pi.

We can set up an equation as we know the circumference as 4pi.

4pi = 2*radius*pi

Divide both sides by pi:

4 = 2*radius

Divide both sides by 2:

radius = 2

Answer 2

2 ft

Explanation:

The equation for circumference is:

`C=2\pi r`

We can plug in the given value for circumference to solve for the radius.

`4\pi=2\pi r`

Divide both sides by 2π

`(4\pi)/(2\pi)=r\\r=2\ ft`