hypotenuse - only if it is a right triangle. Otherwise, there is no special name.
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The longest side of a triangle is called the Hypotenuse.
This side is called the hypotenuse.
In a right triangle (a triangle where one of the angles is exactly 90 degrees) , the longest side is called the hypotenuse. In non-right triangles, the longest side has no special name.
hypotenuse
The opposite side of any angle in a triangle is the side that is not part of the angle. The side opposite the right angle is the longest side, called the hypotenuse.