a ruler? idk
answer: in mathematics, the pythagorean theorem, also known as pythagoras' theorem, is a fundamental relation in euclidean geometry among the three sides of a right triangle. it states that the square of the hypotenuse is equal to the sum of the squares of the other two sides
evidence to support this claim would be something like an equation for the math.
so say that a is 2, b is 4
2 squared would be 4 and 4 squared would be 8. you add 4 and 8, giving you 12. 12 squared is 144. so c would equal 144
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