Given a right triangle, the hypotenuse is the longest side or simply the side opposite the 90o angle.
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Only a right triangle has a hypotenuse, and yes,when there's a hypotenuse, it's the longest side.
The hypotenuse is the side opposite the right angle.
First of all, you have to make sure that it's a RIGHT triangle. That means that one of the angles in the triangle is 90 degrees. If not, then it's not a right triangle, and it doesn't have a hypotenuse. If it IS a right triangle, then the longest side is the hypotenuse.
Hypotenuse
Adjacent side / Hypotenuse