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Is there a special name for the distance from the center of a rectangle to a side? I haven't done geometry in a while, but I thought there was an equivalent of a "radius" for regular polygons.

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Half-length of a side? –  Did Apr 13 '12 at 21:40

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up vote 2 down vote accepted

Maybe the word you want is apothem. But that only applies to squares, not rectangles in general.

Or perhaps you want inradius, although that's usually for triangles.

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Apothem! I knew it was a vaguely funny-sounding word. –  derekerdmann Apr 14 '12 at 1:04

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