Find the missing side of a right-angled triangle with the Pythagorean theorem — plus the area, perimeter and both acute angles.
Enter any two sides of a right-angled triangle. Leave the third blank and press Solve. c is always the hypotenuse (the side opposite the right angle).
Pythagoras' theorem: a² + b² = c². Only works for right-angled triangles. Values are rounded to 2 decimal places.