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Home/Mathematics/Trigonometry/Law of Cosines Calculator
Math CalculatorTrigonometry

Law of Cosines Calculator

Apply the Law of Cosines to find a missing side or angle of any triangle.

Updated 2025-01-153 min readCalzyra Math Team

Calculator

Enter your values below

CalculatorFree Tool

Length of side a.

Length of side b.

The included angle between sides a and b.

Formula & Methodology

How this calculator works

c² = a² + b² - 2ab · cos(C)

The Law of Cosines generalizes the Pythagorean theorem for any triangle. It relates the lengths of the sides to the cosine of one of its angles.

Frequently Asked Questions

Common questions about this calculator

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