Simple "a squared+ b squared= c squared". That means that the 2 shortest sides of a triangle, when squared and then added together should equal the longest side, or the hypotenuse.
My stepfather tried to explain it to me so the example is that: there is a triangle with side lengths 7, 9, 10 so because we know that c has the be the longest side we set it up 7^2+9^2=10^2 or 7x7+9x9=10x10 the equation simplifies to = 49+81=100, 49 + 81=130 not 100 so the triangle is not right.
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