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Old 2006-09-27, 23:21   #11
Wacky
 
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Jun 2003
The Texas Hill Country

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Quote:
Originally Posted by Uncwilly View Post
How do you divide it? Second, any rotated radial lines retains the radial aspect.
Let me describe the solution in polar coordinates.

Assume that the circle is centered at (0,0) and has radius =2. Thus the area is 4 PI.

The first part is bounded by a circle, also centered at (0,0) with radius =1 and area = PI.

Now, draw the line segment from (r=1, Theta=0 degrees) to (r=2, Theta = 30 degrees)

Also draw the line segment (r=1, Theta=120 degrees) to (r=2,Theta=150 degrees)

And the segment (r=1, Theta=240 degrees) to (r=2, Theta=270 degrees)
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