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October 21, 2014

October 21, 2014

Posted by **sita** on Wednesday, October 5, 2011 at 5:01pm.

- geometry -
**Steve**, Wednesday, October 5, 2011 at 6:18pmArea = 1/2 r² θ

Sound familiar? The whole circle has 2π radians, so the area = 1/2 * 2π r^2 = πr^2

Anyway, you have 80°, which is 80*/360 * 2π = 2π/9

So, the area is 1/2 * 2π/9 * 8² = 22.34

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