Triangle Calculator

With base and height: Area = ½ × base × height. With three sides (Heron's formula): calculate s = (a+b+c)/2, then Area = √(s(s−a)(s−b)(s−c)).

Use the Law of Sines (a/sin A = b/sin B) or Law of Cosines (c² = a² + b² − 2ab·cos C). Enter the known values and the calculator solves for the rest.