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The Secrets of Triangles: A Mathematical Journey

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By Alfred Posamentier and Ingmar Lehmann

Web edition: October 5, 2012
Print edition: October 20, 2012; Vol.182 #8 (p. 30)

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This guide to the surprising properties of a fundamental shape sheds light on geometric principles.

Prometheus Books, 2012, 387 p., $26

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