# If #A = <7 ,-5 ,6 >#, #B = <4 ,4 ,9 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Dec 13, 2016

The angle is

#### Explanation:

We start by calculating

The angle between 2 vectors is given by the dot product.

The dot product is

The modulus of

The modulus of