# If #A = <6 ,4 ,-7 >#, #B = <3 ,5 ,2 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Dec 2, 2016

The angle is

#### Explanation:

Let's start by calculating

To calculate the angle

we use the dot product definition

The dot product is

The modulus of

The modulus of