Pythagoras Calculator
Find the missing side of a right angled triangle.
Hypotenuse
5
- Area
- 6
The hypotenuse must be longer than either other side.
v1.0 · Reviewed September 2026
How this is worked out
For a right angled triangle, a² + b² = c². Leave the hypotenuse at zero to find it from the two short sides, or enter it with one short side to find the other.
Worked example
- Side A 3
- Side B 4
- Hypotenuse left at 0
√(3² + 4²)
Hypotenuse 5, area 6
Assumptions and limits
- Only valid for right angled triangles.
- The hypotenuse must be longer than either other side, otherwise the triangle is impossible and no result is shown.
- Units are whatever you use, as long as both sides use the same one.