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Pythagorean theorem

The Pythagorean theorem applies to every right-angled triangle

 


Explanation

The picture shows 3 identical rectangular triangles, ABC, CBD and ACD.

The proportions of the sides are

and

so that

Because AD + BD = AB, the Pythagorean theorem follows directly from this

a2 + b2 = c2

 


Additional information

The old Greek mathematician Pythagoras (572 BC - 500 BC) is famous for his number theory.

 


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