Pythagorean Theorem Calculator
Find the missing side of a right triangle using a² + b² = c².
a² + b² = c²
Find Any Side
Enter any two sides to find the third. Works for legs and hypotenuse.
Triangle Info
Shows area, perimeter, and all angles of the triangle.
Visual
See the right triangle with labeled sides.
FAQ
What is the Pythagorean theorem?
a² + b² = c², where c is the hypotenuse (longest side) of a right triangle.
How to find the hypotenuse?
c = √(a² + b²). For a 3-4-5 triangle: c = √(9 + 16) = √25 = 5.