http://www.jgex.net/collection/index.html
We try to collect all proofs of the Pythagoras Theorem without using
algebra available in books and webpages.
http://www.jgex.net/collection/pyth/index.html
[A] "Proofs without Words: Exercises in Visual Thinking (Classroom
Resource Material)", Roger B. Nelsen, 1993.
[B] "Proofs Without Words II: More Exercises in Visual Thinking
(Classroom Resource Material)", by Roger B. Nelsen, 2001.
[C] "Math Made Visual", by Claudi Alsina and Roger B. Nelsen, 2006.
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