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If you know all the side lengths then you can use the Pythagorean Theorem. The theorem states that a^2+b^2=c^2 when c=the hypotenuse or the side opposite the suspected right angle. So multiply the two shorter sides by themselves (a*a+b*b) and then add them together. Finally, take the square root of this number and if it equals the length of the hypotenuse then the triangle is right. A triangle with the side lengths 3,4, and 5 or multiples of that (i.e. 9, 16, and 25) are right triangles.

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Q: How do you prove a right triangle?
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