- Geometry and Topology
Prove this version of the Law of Cosines b^2 = a^2 + c^2 - 2ac cosA
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
A version of the law of cosines is proven.