Law of tangents gives the relationship between the tangents of two angles of a triangle and the lengths of the opposite sides.
In the triangle above, a, b, and c are the lengths of the three sides of the triangle, and A, B, and C are the angles opposite those three respective sides. The law of tangents states that:
The law of tangents can be used in any case where two sides and the included angle, or two angles and a side, are known. The above equation can be modified for other set of angles as:
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