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Pythagoras, Heron and Urquhart. (Pythagore, Héron et Urquhart.) (French)
Quadrature 96, 42-45 (2015).
Summary: First, we recall a well known formula about the radius of the inscribed circle of a triangle. This formula provides easy proofs of Pythagoras, Heron and Urquhart theorems.
Classification: G40
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