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geometry[powerpc] - compute power of a given point with respect to a given circle
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Calling Sequence
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powerpc(P, c)
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Description
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The power of point P with respect to circle c is  where d is the distance from point P to the center of c, and R is the radius of c.
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The command with(geometry,powerpc) allows the use of the abbreviated form of this command.
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Examples
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