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What is the area of a 20-gon with radius 5 in

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  1. 4 July, 04:42
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    Assuming that is the circumradius:

    Polygon Area = [r^2 * n * sin (360 / n) ] / 2

    Polygon Area = (25 * 20 * sin (18)) / 2

    Polygon Area = (500 * 0.30902) / 2

    Polygon Area = 77.255
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