Right Triangle Calculator
Our free right triangle calculator helps you find all properties of a right-angled triangle, including sides, angles, area, and perimeter. Enter any two values to calculate the rest.
Right Triangle Calculator
You're using two sides mode: enter the lengths of two legs, and the calculator will find the hypotenuse and all angles.
Results
Enter values and calculate to see results
What is a Right Triangle?
A right triangle (or right-angled triangle) is a triangle in which one angle is exactly 90 degrees, making it a right angle. The side opposite to the right angle is called the hypotenuse, and it's always the longest side of the right triangle. The Pythagorean theorem states that in a right triangle, the square of the hypotenuse equals the sum of squares of the other two sides.
Right Triangle Formulas
Here are the key formulas used in our right triangle calculator:
| Property | Formula |
|---|---|
| Hypotenuse (c) | c = √(a² + b²) |
| Area | A = (a × b) / 2 |
| Perimeter | P = a + b + c |
How to Use the Right Triangle Calculator
- Enter any two known values (sides or angles) in the calculator.
- Click the "Calculate" button to see the results.
- The calculator will automatically find all missing sides, angles, area, and perimeter.
- If you want to perform a new calculation, click the "Reset" button and enter new values.
Important Notes
- Since this is a right triangle calculator, one angle is always 90 degrees.
- The sum of the other two angles must equal 90 degrees (since all angles in a triangle sum to 180 degrees).
- Make sure to enter positive values for sides. Angles must be between 0 and 90 degrees.