Triangle Calculator
Calculate all properties of a triangle given three sides, two sides and an angle, or one side and two angles. Find area, perimeter, and triangle type.
Select Calculation Mode
Choose the method for calculating the triangle.
Input
Enter all three side lengths (SSS)
Triangle Calculation Information
- SSS: When all three sides are known, use the Law of Cosines to calculate angles.
- SAS: When two sides and the included angle are known, use the Law of Cosines to find the third side.
- ASA: When one side and two angles are known, use the Law of Sines to find the remaining sides.
Triangle Inequality: The sum of any two sides must always be greater than the third side.