Triangle Hypotenuse Calculator

b a c
Hypotenuse (c) = 5
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How to Calculate the Hypotenuse

The Pythagorean Theorem

The hypotenuse (c) of a right triangle can be calculated using the Pythagorean theorem:
c = √(a² + b²)
where a and b are the lengths of the other two sides.

Common Right Triangle Examples

  • 3-4-5 Triangle: Most common right triangle with whole number sides
  • 45-45-90 Triangle: Isosceles right triangle where a = b
  • 30-60-90 Triangle: Special right triangle where shortest side × 2 = hypotenuse