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Radius

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The radius of a circle is the distance from the center to any point on the circle. Identical definitions hold for the sphere and hypersphere.

size(115);pair O=origin, P=dir(30);D(unitcircle);D(O--P);MP("O",D(O),NNW);MP("P",D(P),NE);MP("r&quot...

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Want to learn how to tackle those tough AMC/AIME/Olympiad algebra problems? Check out Art of Problem Solving's Intermediate Algebra by Richard Rusczyk and Mathew Crawford. Over 1600 problems!
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