Triangle Angle Calculator - Multi-Tools

Triangle Angle Calculator

Calculate angles of a triangle using sides, other angles, or coordinates.

c² = a² + b² - 2ab cos(γ)

b² = a² + c² - 2ac cos(β)

a² = b² + c² - 2bc cos(α)

a/sin(α) = b/sin(β) = c/sin(γ) = 2R

where R is the circumradius

α + β + γ = 180°

Note: The sum of all angles in a triangle is always 180 degrees. The Law of Sines and Law of Cosines are used to calculate unknown angles and sides.

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