58.1k views
7 votes
The circumference of a circle is 4pi. Find its radius, in feet.

User Teleo
by
6.5k points

2 Answers

12 votes

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

User Narigo
by
6.3k points
9 votes

Answer:

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

User Landstalker
by
6.2k points
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