hypotenuse

/haɪˈpɑtənus/
noun
  1. The longest side of a right triangle, opposite the right angle.
    • In a right triangle, the hypotenuse is always longer than either of the other two sides.
    • To find the length of the hypotenuse, you can use the Pythagorean theorem.
    • The ladder forms the hypotenuse of a right triangle with the ground and the wall.