which set of side lengths will make a right triangle?

4in,5in,12in

1in,2in,4in

5in,12in,13in

10in,4in,5in

it's 5, 12, 13

because 5^2 + 12^2 = 13^2

Right triangles always follow Pythagorean's theorem where the sum of the square of the legs always equals the square of the hypotenuse.

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