Posted by **Chris** on Friday, November 16, 2012 at 5:17pm.

The area of a circus ring is about 1,385 square feet. What is the circumference of the ring?

- Math -
**Ms. Sue**, Friday, November 16, 2012 at 5:21pm
A = pi * r^2

1385 = 3.14 * r^2

1385/3.14 = r^2

44.108 = r

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

C = pi * d

C = 3.14 * 88.2

C = ?

- Math -
**mathgeekdude**, Friday, November 16, 2012 at 5:23pm
use area of circle formula.

a=pi r^2

c=pi d

Thus, we need to plug in numbers. 1385/pi = r^2. We take the square root of that to get the radius.Then, we can double that radius and multiply by pi to get the circumference.

the formula would be 2pi sqrt1385/sqrt pi

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