# If #A = <5 ,2 ,8 >#, #B = <2 ,5 ,6 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Feb 22, 2017

The angle is

#### Explanation:

et's start by calculating

The angle between

Where

The dot product is

The modulus of

The modulus of

So,