# If #A = <7 ,-5 ,6 >#, #B = <4 ,-8 ,9 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Write your answer here...

Start with a one sentence answer

Then teach the underlying concepts

Don't copy without citing sources

preview

?

#### Answer

Write a one sentence answer...

#### Answer:

#### Explanation

Explain in detail...

#### Explanation:

I want someone to double check my answer

Douglas K.
Share

Oct 13, 2016

#### Answer:

#### Explanation:

Compute vector C:

Compute the dot-product of vectors A and C:

There is another form for the equation of the dot-product that contains the angle between the two vectors:

Compute the magnitude of vector A:

Compute the magnitude of vector C:

Was this helpful? Let the contributor know!

##### Add an answer

Write your answer here...

Start with a one sentence answer

Then teach the underlying concepts

Don't copy without citing sources

preview

?

#### Answer

Write a one sentence answer...

#### Answer:

#### Explanation

Explain in detail...

#### Explanation:

I want someone to double check my answer

Describe your changes (optional) 200