Triangle Calculator

Solve any triangle from partial information. Enter any 3 values (at least one side) — sides a, b, c and angles A, B, C — and the calculator uses the law of sines and law of cosines to find all remaining values.

Sides a, b, c are opposite to angles A, B, C respectively. Enter at least one side. Angles in degrees.

Side a

Side b

Side c

Angle A (°)

Angle B (°)

Angle C (°)

Law of Cosines: c² = a² + b² - 2ab·cos(C). Law of Sines: a/sin(A) = b/sin(B) = c/sin(C). These allow solving all triangle cases: SSS, SAS, AAS, ASA (SSA may have 0, 1, or 2 solutions).