Posted by **mary** on Monday, April 18, 2011 at 4:19pm.

Need help I missed this problem on my test. My answer was 31.8in^2. The right answer was 8.0in^2

How should I have worked the problem:

A pie has a diameter of 9 inches. Each slice of the pie has a central angle of 45 degrees. What is the area of each slice of pie?

- Geometry -
**Ms. Sue**, Monday, April 18, 2011 at 4:28pm
A = pi * r^2

A = 3.14 * 4.5^2

A = 3.14 * 20.25

A = 63.585 sq. in.

The pie is divided into 8 pieces.

63.585 / 8 = 7.948 sq. in. >> rounded = 8 square inches.

- Geometry -
**anna**, Thursday, May 22, 2014 at 11:42am
Find the area of a regular octagon with a perimeter of 80 inches round to the nearest tenth

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