Math Dictionary / Hypotenuse
Hypotenuse
The hypotenuse is the longest side of a right triangle.
GeometryGrade 8Algebra 1GEDSATACT
What it means
It is always across from the right angle.
Also called: longest side of a right triangle
Examples
| In a 3-4-5 right triangle, 5 is the hypotenuse |
| The hypotenuse is labeled c in a^2 + b^2 = c^2 |
| It is across from the 90-degree angle |
Common mistake
The hypotenuse exists only in a right triangle.
Try one
Question: A right triangle has side lengths 5, 12, and 13. Which side is the hypotenuse?
Show answer
13, because it is the longest side.