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Right Triangle
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Concept

Right Triangle

A right triangle is a specific type of triangle that contains a right angle. The side that lies opposite the right angle is always the longest and is known as the hypotenuse. The other sides are commonly called legs.
Right triangle
If one of the acute angles in the triangle is labeled, the legs can be discussed relative to that angle. Consider an acute angle labeled as on the diagram. The side that forms the angle is the adjacent side and the side not touching the angle is the opposite side.
Sides of a right triangle labeled
Note that the opposite and adjacent sides change when changes, but the hypotenuse is always the same.
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