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a^2 + b^2 = c^2

what is the demonstration of this rule with triangle which has 90 deg? can be proofed using geometry?

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marked as duplicate by user127.0.0.1, Lee Yiyuan, hardmath, egreg, M Turgeon Mar 27 '14 at 12:50

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Which notions of geometry can you recall for the demonstration?

Here you can find some different proofs of the Pythagorean Theorem.

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It is not for Phythagore. It is for a Muslim man who is GHeyth Edin ELKASHI : en.m.wikipedia.org/wiki/Al-Kashi –  Abdennour TOUMI Mar 28 '14 at 8:06

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