One of the most famous relationships in all of mathematics is the Pythagorean Theorem for right triangles, which tells us that one leg squared plus the other leg squared is equal to the hypotenuse squared. It is often written as "a squared" plus "b squared" equals "c squared," but this is often vague. It is imperative that both "a" and "b" represent the perpendicular legs, and "c" represents the hypotenuse, which is always the side across from the right angle. From there, use simplification of radicals to find missing side lengths.
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