Triangle Angle Calculator

Enter two known angles of a triangle. The third angle and the triangle's type are worked out for you.

Angle A (°) Angle B (°)

Angle C — 180° − A − B —

Valid triangle? — all angles must be > 0° and sum to 180° —

Triangle type — by angles —

Triangle type — by sides (equilateral / isosceles / scalene) —