Triangle Calculator
Enter any two sides (a, b, c) or a side and an angle to solve the triangle. Angles are in degrees.
Triangle Formulas
Law of Cosines
c² = a² + b² − 2ab · cos(C)
Law of Sines
a / sin(A) = b / sin(B) = c / sin(C)
Area (Heron’s Formula)
s = (a+b+c)/2 Area = √(s(s−a)(s−b)(s−c))
Angle Sum
A + B + C = 180°
