For any triangle with sides a, b, c and the angle C opposite to c, the law of cosines states c² = a² + b² − 2ab cos(C). Recovers the Pythagorean theorem at C = π/2. Dual to the law of sines; foundation of trigonometric side/angle…
For any triangle with sides a, b, c and the angle C opposite to c, the law of cosines states c² = a² + b² − 2ab cos(C). Recovers the Pythagorean theorem at C = π/2. Dual to the law of sines; foundation of trigonometric side/angle…