Frequently Asked Questions
When do I use the law of cosines?
Use it when you know two sides of a triangle and the angle between them and need the third side and the remaining angles.
How is it related to the Pythagorean theorem?
When the included angle is 90°, cos(90°) = 0, and the law of cosines c² = a² + b² − 2ab·cos C reduces exactly to a² + b² = c².
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