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Home › Calculators › Trigonometry Calculators › Law of Cosines Solver

Law of Cosines Solver

Solve for missing sides or angles when SAS or SSS is known.
Input Values

SAS: fill a, b, Angle C — leave Side c blank.  SSS: fill a, b, c — leave Angle C blank.

units
units
units
°
Triangle Preview
a b c A B C
c² = a² + b² − 2ab cos C
Learn the concept
Real-World Applications of Trigonometry
Apply the Law of Sines, Law of Cosines, and angles of elevation and depression to solve real-world problems involving non-right triangles and navigation.
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