Law of Cosines Calculator

Online trigonometry calculator, which helps to calculate the unknown angles and sides of triangle using law of Cosines.

Calculate Triangle Angles and Sides

Select Triangle Side:
 
Side b=
Side c=
Cos A=
 
 
Side a=
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Formula:

a =√b2 + c2 - 2bc cos A b =√a2 + c2 - 2ac cos B c =√a2 + b2 - 2ab cos C

Triangle angles and sides calculation is made easier here using this law of cosines calculator

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