Pythagoras was interested in triangles when he found out that for any right angle triangle that when its hypotenuse is squared it is equal to the sum of its two squared sides.
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Pythagoras theorem
Right angled triangles.
A right angle is always 90 degrees. Another Answer:- If you mean the length of the hypotenuse then use Pythagoras' theorem which is applicable to right angle triangles
His work on right angle triangles is known as Pythagorases Theorum and it states that.. "The square of the hypotenuse is equal to the sum of the squares of the other two side."
Pythagoras wife is Theano.