Question 574016
How tell whether the given side lengths form a right triangle?
3,4,5
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3, 4, 5 is a right triangle.  Everyone knows that.
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If the square of the longest side = the sum of the squares of the other 2 sides, it's a right triangle.
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{{{5^2 = 3^2 + 4^2}}}
{{{13^2 = 5^2 + 12^2}}}