# Prove this version of the Law of Cosines b^2 = a^2 + c^2 - 2ac cosA

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Consider a triangle with sides a, b and c and angles A, B and C. Prove the following version of the Law of Cosines :

b^2 = a^2 + c^2 - 2ac cosA

Â© BrainMass Inc. brainmass.com March 4, 2021, 5:40 pm ad1c9bdddfhttps://brainmass.com/math/geometry-and-topology/prove-version-law-cosines-5302

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A version of the law of cosines is proven. A triangle with sides a, b, and c are found.

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