Why.?.............if u made a triangle....................whose hyp is 1/2.....................the square of that has to match the added squares of the other two sides...........1/2 squared is 1/4..................the cool thing.........at least in theory of a circle........of one half..............a radius of 1/2.........is that its circumference would be exactly pi.............
mathworld.wolfram.com
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In mathematics, the Pythagorean theorem, also known as Pythagoras's theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.
https://en.wikipedia.org/wiki/Pythagorean_theorem
https://www.mathsisfun.com/pythagoras.html
Pythagoras' Theorem. Pythagoras. Over 2000 years ago there was an amazing discovery about triangles: When a triangle has a right angle (90°) .
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