Proof of Pythagorean Theorem

mathfreak77

Wait, isn't there a little animation in the AOPS website that explains the Pythagorean Theorem? It's under all the line of words at the left. I think it explains it pretty clearly.

**Posted:** Sun May 24, 2009 8:33 am

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nikeballa96

by the way, its relatively trivial to prove that $\sin^2x+\cos^2x=1$ with the equation of a circle and a unit circle.

**Posted:** Sun May 24, 2009 8:37 am

mathboy101

Here is a proof.

**Posted:** Thu Jun 18, 2009 5:47 am

myyellowducky82

People, please. Stop arguing over who's spamming. Then YOU'RE the ones who are spamming.
Back to the Theorem. There's a proof on page 135 of the Introduction to Geometry book (2nd edition). It's sort of like mathboy101's proof, in a way. You don't even need to use sine and cosine (but they are too advanced for this forum, by the way.)

**Posted:** Tue Jun 30, 2009 5:15 pm

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fishythefish

It's circular logic, one of the biggest dangers in geometry.

**Posted:** Mon Oct 26, 2009 4:10 pm

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Dojo

There are several proofs here here.

**Posted:** Mon Oct 26, 2009 9:39 pm

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batteredbutnotdefeated

random proof(well... not really a proof)

**Posted:** Tue Oct 27, 2009 2:15 pm

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