Find a missing side or angle in any triangle. Also try the SOH CAH TOA calculator for right-angled triangles.

Side a

Angle A (°) — opposite a

Angle B (°)

Side a

Side b

Angle A (°) — opposite a

Side a

Side b

Angle C (°) — included angle

Side a

Side b

Side c

Guided practice — answer a question at each step before the working is revealed (like the simultaneous equations solver).

Sine & cosine rule calculator