Question

the side opposite the right angle in a right triangle. hippopotamus hypotenuse opposite side hip hop anonym

Explanation:

In a right - triangle, the side opposite the right angle is defined as the hypotenuse. The other options are either completely unrelated (Hippopotamus, Hip Hop Anonym) or refer to a different side in a right - triangle (Opposite Side, which is relative to an acute angle, not the right angle).

Answer:

Hypotenuse