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You use the law of cosines to relate the 3 sides of a triangle to one of the angles. So if you are given the 3 sides you can find the angle; or if you are given two sides and the included angle (the angle between the two sides) you can find the side opposite the included angle. The law of sines relates the angles and the sides opposite them.What is the formula for cosine rule?
The Law of Cosines (also called the Cosine Rule) says:. c 2 = a 2 + b 2 − 2ab cos(C). It helps us solve some triangles. Let's see how to use it.When to use cosine rule?
Cosine Rule (The Law of Cosine) The Cosine Rule is used in the following cases: 1. Given two sides and an included angle (SAS) 2. Given three sides (SSS) The Cosine Rule states that the square of the length of any side of a triangle equals the sum of the squares of the length of the other sides minus twice their product multiplied by the cosine ...