What is the Triangle Calculator?
Solve a triangle in one step. Enter three sides (SSS) or two sides and the angle between them (SAS) and the calculator finds every missing side and angle using the law of cosines, plus the area (Heron’s formula), perimeter, heights and the triangle type (equilateral, isosceles, scalene, right, acute or obtuse).
How to use the Triangle Calculator
- Choose 3 sides or 2 sides + angle.
- Enter the values.
- Read the full solution.
Formulas used
- Law of cosines: c² = a² + b² − 2ab·cos C
- Heron’s formula: Area = √(s(s−a)(s−b)(s−c)), s = (a+b+c)/2
- Angles of a triangle always add up to 180°
This Triangle Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech