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The area of a circular shape, with radius r is pi*r2 where pi is the irrational number which is approx 3.14159.

To get the area of a pie, you need to know the portion that the pie represents out of a whole circle. If you can find the angle, then divide by 360. Example, a 30° angle is 1/12 of a full circle (30°/360° = 1/12), so you would find the area of a circle with the given radius, then divide by 12, in this case.

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