Pythagorean Theorem Calculator
Solve any right triangle in seconds. Enter any two sides and the third is found automatically, or enter all three to check whether the triangle satisfies the Pythagoras theorem — with a clear diagram showing the hypotenuse and legs.
How to use
- Enter any two of the three sides and leave the third empty — the missing side is found automatically.
- Enter all three sides and the tool will check whether the triangle satisfies the Pythagoras theorem.
- Remember: side c is always the hypotenuse (opposite the 90-degree angle), and a and b are the two legs.
Note: Formula: a² + b² = c². The hypotenuse is always longer than each leg; if a leg is entered longer than the hypotenuse, the calculation is not possible.
Frequently Asked Questions (FAQ)
What can this calculator find?
The missing side of a right triangle from the other two sides, or it can check whether three sides satisfy the theorem.
Which side is the hypotenuse?
Side c is always the longest side, opposite the right angle; a and b are the two sides that form the right angle.
Why can the calculation fail?
If a leg is entered longer than the hypotenuse, the calculation is not possible.
Do results update as I type?
Yes, enter values and the result shows live.
Can it check if three sides form a right triangle?
Yes. Enter all three sides and it tests whether a squared plus b squared equals c squared, telling you if it is a correct right triangle.