Resultant Vector Cosine Rule. The cosine rule also known as the law of cosines relates all 3 sides of a triangle with an angle of a triangle. The Law of Cosines also called the Cosine Rule says.
It has application along with the law of sines to the problem of the heading angle for an aircraft in the wind. To find the difference between two vectors as in a glancing collision. In this tutorial you will learn how to find the sum of two vectors calculate their result magnitude and direction using the sine and cosine rules.
The law of cosines has application to vector quantities.
It states that the vectors to be added are arranged in such a way so that the head of first vectors coincides with the tail of second vector whose head coincides with the tail of third vector and so on then the single vector drawn from the tail of the first. U 2 u 1 2 u 2 2. Determine the angle between and. Lets see how to use it.