4.2 Non-right Triangle
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All edges of the triangle are given but no angles are provided or two edges are given and the angle formed by them are given, and the third edge is to be calculated. In situations like these, the cosine rule is the quickest way to get to the answer.
Though there are three equations below, the basic idea is the same that you put the edges and angle enclosed by those edges on right side of equation and the edge opposite the angle on the left side.