Only a right triangle has a hypotenuse, and yes,
when there's a hypotenuse, it's the longest side.
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Hypotenuse
Given a right triangle, the hypotenuse is the longest side or simply the side opposite the 90o angle.
The formula of the hypotenuse (the longest side of the triangle) is the other two lengths squared and added together.
It is the side opposite the right angle. It is also the longest side.
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.