# Thread: Find Angle Between Vector

1. ## Find Angle Between Vector

<3,1> x <4,-5>

2. ## Re: Find Angle Between Vector

Originally Posted by Mc3
<3,1> x <4,-5>
The angle between $\vec{A}~\&~\vec{B}$ is $\arccos \left( {\frac{{\vec{A}\cdot\vec{B}}}{{\|\vec{A}\|~\|\vec{ B}\|}}} \right)$

3. ## Re: Find Angle Between Vector

I tried cos^1 7/ square root 10 x square root 41 but it says error on my calc?

4. ## Re: Find Angle Between Vector

You must have plugged it in wrong to the calculator. It is in the range of arcos.