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Hypotenuse

The hypotenuse is the longest side of a right triangle, opposite the right angle. Learn the definition and how to find it with the Pythagorean theorem.

Solve it with the AI Math Solver

Which side it is

In a right triangle, the side across from the right angle is the hypotenuse. It is always the longest side because it spans the widest separation of any two points on the triangle.

Finding it

The Pythagorean theorem ties the hypotenuse to the two legs: a² + b² = c². Take the square root of the sum of the squared legs to get the hypotenuse directly.

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Frequently asked questions

1

What is the hypotenuse?

The hypotenuse is the longest side of a right triangle — the side opposite the 90° angle. The other two sides are called legs.

2

How do I find the hypotenuse?

Use the Pythagorean theorem: c = √(a² + b²), where a and b are the legs. The sum of their squares equals the square of the hypotenuse.

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