Find the hypotenuse, area, perimeter and angles of a right triangle.
Calculated locally in your browser.
Understanding your result
This assumes a right angle between sides a and b.
Formula and method
Hypotenuse c = √(a² + b²); area = ½ × a × b; angles come from the arctangent of the opposite over adjacent sides.
Worked example
Legs of 3 and 4 give a hypotenuse of 5 and an area of 6.
How to use this tool
- Enter side a and side b (the legs).
- Press Calculate.
Common mistakes to avoid
- Entering the hypotenuse as one of the legs.
About the Right Triangle Calculator
Enter the two legs of a right triangle to find the hypotenuse, area, perimeter and the two acute angles.
Frequently asked questions
What is the Pythagorean theorem?
In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.