Regarding side length, a triangle is a right triangle if …
a² + b² = c²
A triangle is a right triangle if and only if one of its angles is a right angle, which means it measures exactly 90 degrees. In other words, if a triangle has one angle that is a right angle, then it is a right triangle. The side opposite to the right angle is called the hypotenuse, and it is the longest side of the triangle. The other two sides are called the legs of the right triangle, and they form the right angle. The Pythagorean Theorem can be used to find the length of any side of a right triangle, given the lengths of the other two sides.
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