Pythagorean Theorem Calculator
Pythagorean Theorem Calculator a² + b² = c²
Find the hypotenuse, find the missing leg, or check whether a triangle is a right triangle.
The calculator above finds the missing side of a right triangle: the hypotenuse from two legs, or a leg from the hypotenuse and the other leg.
Formulas used
c² = a² + b²
a = √(c² − b²)
- c is the hypotenuse, the side opposite the right angle and the longest side.
Worked example
Legs 6 and 8:
c = √100 = 10
Enter the same values in the calculator above to see every step of the solution.
How to use the calculator
- Enter the two known sides and choose which side is missing.
- Press the calculate button. The result appears instantly.
- Read the step-by-step solution, rendered with KaTeX, to check your own work.