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The Product of the Inradius and Semiperimeter of a Triangle


	Let ABC be a triangle, its inradius, and its semiperimeter. Then .


	Contributed by: Jay Warendorff After work by: Alexander Bogomolny

A. Bogomolny, "Relations between Various Elements of a Triangle," Interactive Mathematics Miscellany and Puzzles.

Contributed by: Jay Warendorff

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