Right Triangle Calculator
Given two legs, a leg and the hypotenuse, or a side and an acute angle, solve the whole right triangle.
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Result
Formula
a² + b² = c² · sin A = a/c · tan A = a/b
About this calculator
Solve a right triangle from any two known values: two legs, a leg and the hypotenuse, a leg and an acute angle, or the hypotenuse and an acute angle. The calculator returns the missing sides, both acute angles, area, and perimeter.
How to use
- 1
Select the known values from the 'Known' options.
- 2
Enter the two known measurements in the fields shown.
- 3
Click Calculate to see the missing sides, angles, area, and perimeter.
Frequently asked questions
What is a right triangle?
A right triangle is a triangle that has one angle equal to 90 degrees. The side opposite the right angle is called the hypotenuse, and it is the longest side.
How do I find the hypotenuse if I know the two legs?
Use the Pythagorean theorem: c = √(a² + b²), where a and b are the lengths of the legs.
Can I use this calculator for non-right triangles?
No, this calculator is specifically designed for right triangles. For other triangles, please use the general Triangle Calculator.
Please note: Results are estimates for general information only and are not professional or medical/financial advice.