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About This Tool
The Pythagorean Theorem Calculator finds the missing side of a right triangle when you know the other two sides. Based on the fundamental relationship a² + b² = c², where c is the hypotenuse, this tool solves for whichever value you leave blank.
The Pythagorean theorem is one of the most important concepts in geometry and has countless applications in construction, navigation, physics, and computer graphics.
Enter any two of the three sides (a, b, or c) and the calculator will compute the missing side, the area of the triangle, and the perimeter.