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written by Alexander Bogomolny
This webpage provides facts and a short explanation of the Pythagorean Theorem before continuing on to more than 90 ways to prove it. Many of the proofs are accompanied by Java simulations.

Historical background on the discovery and use of the Pythagorean Theorem is also provided.
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© 1996 Alexander Bogomolny
The applets may be licensed by teachers for inclusion in their own pages.
Keywords:
Euclidean geometry, history, metric, parallel postulate, pythagorean theorem
Record Creator:
Metadata instance created June 12, 2009 by Gregory Comer
Record Updated:
February 25, 2011 by Lyle Barbato
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AIP Format
A. Bogomolny, (1996), WWW Document, (http://www.cut-the-knot.org/pythagoras/index.shtml).
AJP/PRST-PER
A. Bogomolny, Pythagorean Theorem and its many proofs (1996), <http://www.cut-the-knot.org/pythagoras/index.shtml>.
APA Format
Bogomolny, A. (1996). Pythagorean Theorem and its many proofs. Retrieved May 2, 2025, from http://www.cut-the-knot.org/pythagoras/index.shtml
Chicago Format
Bogomolny, Alexander. Pythagorean Theorem and its many proofs. 1996. http://www.cut-the-knot.org/pythagoras/index.shtml (accessed 2 May 2025).
MLA Format
Bogomolny, Alexander. Pythagorean Theorem and its many proofs. 1996. 2 May 2025 <http://www.cut-the-knot.org/pythagoras/index.shtml>.
BibTeX Export Format
@misc{ Author = "Alexander Bogomolny", Title = {Pythagorean Theorem and its many proofs}, Volume = {2025}, Number = {2 May 2025}, Year = {1996} }
Refer Export Format

%A Alexander Bogomolny %T Pythagorean Theorem and its many proofs %D 1996 %U http://www.cut-the-knot.org/pythagoras/index.shtml %O text/html

EndNote Export Format

%0 Electronic Source %A Bogomolny, Alexander %D 1996 %T Pythagorean Theorem and its many proofs %V 2025 %N 2 May 2025 %9 text/html %U http://www.cut-the-knot.org/pythagoras/index.shtml


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