Method
Side a
Side b
Side c (SSS)
Angle A (°)
Angle B (°)
Result (click to copy)
Frequently Asked Questions
What is SSS, SAS, ASA?
SSS: you know all 3 sides. SAS: you know 2 sides and the included angle. ASA: you know 2 angles and the included side. Any of these combinations fully defines a unique triangle.
How do I find the area of a triangle?
Using Heron's formula: Area = √(s(s-a)(s-b)(s-c)) where s = (a+b+c)/2. Alternatively: Area = ½ × base × height. This calculator uses Heron's formula which works from side lengths alone.