Enter any two known sides (two legs, or one leg and the hypotenuse) to find the missing side, both acute angles, and the area.
Fill in exactly two values, leave the unknown one blank.
This tool solves a right triangle (one angle is 90 degrees) using the Pythagorean theorem when any two of the three sides are known.
The Pythagorean theorem states that the hypotenuse squared equals the sum of the squares of the two legs, or c squared equals a squared plus b squared.
Enter any two of the three side values and leave the unknown one blank. Click Calculate to find the missing side, both acute angles, area, and perimeter.
Example: If leg a is 3 and leg b is 4, the hypotenuse is 5, with angle A equal to 36.87 degrees and angle B equal to 53.13 degrees.
Which side is the hypotenuse. It is always the longest side, located opposite the 90 degree angle.
Can all three angles be found from two sides. Yes, since one angle is always 90 degrees, the other two can be calculated using inverse trigonometric functions.