By constructing a right angle triangle whereas its hypotenuse when squared is equal to the sum of its squared sides which is known as Pythagoras' theorem.
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he discovered it in 196C
You can draw it on paper. Not sure what you mean with "working model": this is not about a physical device. Pythagoras' Theorem is about one specific type of calculatoin.
Pythagoras wife is Theano.
Pythagoras
Pythagoras theorem