Pythagorean Theorem Calculator
Find a missing side of a right triangle. The result updates as you type, with the working underneath so you can check it.
Your details
Result
Hypotenuse
5
- Area
- 6
- Perimeter
- 12
- Angle opposite a
- 36.87°
Good to know: a² + b² = c²
About this tool
Formula
a² + b² = c²
Questions people ask
Does it only work for right triangles?
Yes. c is the hypotenuse, the side opposite the right angle.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators