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September 23, 2014

September 23, 2014

Posted by **Katherine** on Wednesday, March 17, 2010 at 7:57pm.

- math -
**Ms. Sue**, Wednesday, March 17, 2010 at 8:05pmYou need to find the area of both circles. Then subtract the area of the inner circle from the outer circle.

A = pi * r^2

A = 3.14 * 15^2

A = 3.14 * 225

A = 706.5 square feet

A = 3.14 * 21^2

A = 3.14 * 441

A = 1384.74 square feet

1384.74 - 706.5 = ?

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