# Question #491a2

##### 2 Answers

We know that for two vectors

where

For the given problem

This has already been calculated but repeated for the sake of clarity.

Now we know that **Triangle law of vector addition** states that when **two sides of a triangle** represent **two vectors** in **magnitude and direction taken in same order** then **third side** of that triangle gives us **the magnitude and direction the resultant** of the vectors.

As shown in the figure above, when a vector parallel to

The angle between vectors

#### Explanation:

My answer is on the basis of the definition that