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Math Calculators
Law of Cosines Calculator
Find the third side of a triangle using the Law of Cosines, given two sides and the angle between them, with independent unit choices for each side and the result.
Side c
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About the Law of Cosines Calculator
The Law of Cosines generalizes the Pythagorean theorem to any triangle, letting you find a missing side when you know two sides and the angle between them. Sides a and b each have their own unit selector, and so does the resulting side c, so you can mix units freely.
Formula: c² = a² + b² − 2ab·cos(C)
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