Definition: The longest side of a right triangle. The side opposite the right angle.
In a right triangle (one where one interior angle is 90°), the longest side is called the hypotenuse.
It is always the side opposite the 90° angle. See Right Triangle definition.
Pythagoras' Theorem applies to right triangles and states (in word form):
"The square on the hypotenuse is equal to the sum of the squares on the other two sides."
See Pythagoras' Theorem.
Other triangle topics
Perimeter / Area
Congruence and Similarity
Triangle quizzes and exercises
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