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Euclid
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[[Fasciculus:Pythagoras-2a.gif|thumb|Commotus geometricus approbatio theoremae Pythagorae]]
In [[Geometria Euclideana]], '''[[theorema]] Pythagorae'''<ref>[http://books.google.de/books?id=_QoAAAAAYAAJ&pg=PA238&lpg=PA238&dq=Theorema+Pythagorae&source=web&ots=L9e6QdC7wC&sig=my9VpJhhdHtLed-p6QoA29SdtO0&hl=de Lamberti Bos ellipses Graecae]</ref> vel '''sententia Pythagorae'''<ref>[http://www.tertullian.org/articles/evans_res/evans_res_03latin.htm Q. Septimii Florentis Tertulliani de Resurrectione Carnis liber]</ref> dicit [[triangulum|trianguli]] recti [[hypothenusahypotenusa]]m quadratam aequalem esse summae aliorum laterum quadratorum.
 
Enuntiatum theoremae est: in triangulo ABC, ubi angulum rectum est in B et hypothenusahypotenusa est AC, habemus AB² + BC² = AC².
 
Generaliter, si ''u'' et ''v'' duo orthogoni [[vector]]es in [[spatium hilbertianum|spatio hilbertiano]] sunt, tunc <math>\left\Vert u\right\Vert^2 + \left\Vert v\right\Vert^2 = \left\Vert u+v\right\Vert^2</math>.