Skill: pythagorean-theorem
Pythagorean Theorem Calculator
Three tools in one: find the hypotenuse, find a missing leg, or check whether three numbers form a Pythagorean triple. Every answer comes with the full working shown step by step — including simplified radicals.
Find the hypotenuse
Enter the two legs. The calculator adds the squares and takes the root — simplifying the radical when needed.
c² = a² + b² → c = √(a² + b²)
Find a missing leg
Enter the hypotenuse and one leg. The hypotenuse must be the longest side.
b² = c² − a² → b = √(c² − a²)
Pythagorean triple checker
Enter any three positive whole numbers. The checker tests a² + b² = c² and spots scaled triples.
A triple satisfies a² + b² = c² exactly.