Thread: geometry help
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Old May 19th, 2008, 04:25 PM
icemanfan icemanfan is offline
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Originally Posted by Zyger View Post
I need help solving these math problems, I have no idea how to do them:


the circle one I need the are aof the shaded figure
the p-gram one, i need the area
the pentagon, I need the apothem, area, and side length
For the circle problem, you need to compute the radius first, which is 3\sqrt{2}. Then, the area of the semicircle is \frac{1}{2}\pi r^2. We subtract out the area of the triangle to obtain the area of the shaded region: \frac{1}{2}\pi (3\sqrt{2})^2 - (3\sqrt{2})^2 = 9\pi - 18.
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