Pythagorean Calculator

Enter any two sides and leave the third blank. The tool applies a² + b² = c², rearranged for the missing side, and shows every substitution step.

That's impossible — the hypotenuse is always the longest side of a right triangle. You'll get an error asking you to check your numbers.

With inverse tangent: the angle opposite leg a is arctan(a/b), and the other acute angle is 90° minus that.

Half the rectangle the legs make: A = a × b / 2.

No — the Pythagorean theorem only applies to right triangles. Use the Triangle Solver for SSS, SAS, ASA, and AAS cases.