# If #A = <2 ,3 ,6 >#, #B = <5 ,1 ,7 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Nov 20, 2016

The angle is

#### Explanation:

Let's start by calculating

The angle betwwen two vectors is given by the dot product.

Where

The dot product is

The modulus of

The modulus of

Therefore,