Input Values
Result
Enter two sides and click Calculate to find the third.
About Right Triangles
A right triangle has one 90° angle. The side opposite to the right angle is called the hypotenuse (c), and it's always the longest side.
Pythagorean Theorem: a² + b² = c²
- Area: A = (a × b) / 2
- Perimeter: P = a + b + c
Where a and b are the legs, and c is the hypotenuse.