# If #A = <6 ,8 ,-3 >#, #B = <7 ,1 ,-4 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Nov 8, 2016

The angle is

#### Explanation:

Let's start by calculating

The angle between

where

The dot product is

The modulus of

The modulus of

So