The longest side.
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The longest side of a triangle is opposite its biggest angle.
The side opposite the right angle is the hypotenuse.
the side/angle that is across from an angle or side. the opposite side or angle does not touch the what it is opposite from
The side opposite the right angle of a right angle triangle is the hypotenuse
It is a characteristic of any triangle that the longest side is opposite the largest angle and the shortest side is opposite the smallest angle.