Right triangle definition
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A right triangle is a type of triangle that has one angle measuring exactly 90 degrees. This angle is called a right angle, and it occurs where one of the triangle's sides meets another at a perfect perpendicular, or 90-degree, angle. The other two angles of a right triangle are always acute angles, meaning they measure less than 90 degrees. The side opposite the right angle is called the hypotenuse, and it is always the longest side in the triangle.