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Law of Cosines: Mathematics

The law of cosines can be considered as an extension of the Pythagorean theorem applies to all triangles. She stated as: the square of one side of untriángulo is equal to the sum of the squares of the other two sides minus twice the product of these two sides times the cosine of the angle. If we apply this theorem to the triangle in Figure 1 we get three equations:

solve a triangle means to obtain the value of the length of three sides and the measure of its three angles.

To resolve that we are rectangles, triangles using the law of cosines and / or the law of sines. Everything will depend on the known values.