Find U ● V, angle between them is 55°, |u| = 6, |v|=4. I was wondering how to set this up, thanks.

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- Feb 25th 2014, 06:27 AMIStandAlone99Find U dot V
Find U ● V, angle between them is 55°, |u| = 6, |v|=4. I was wondering how to set this up, thanks.

- Feb 25th 2014, 06:41 AMHallsofIvyRe: Find U dot V
One fairly standard

**definition**of the dot product of u and v is $\displaystyle |u||v| cos(\theta)$ where $\displaystyle \theta$ is the angle between the vectors. Have you not seen that before? - Feb 25th 2014, 06:44 AMIStandAlone99Re: Find U dot V
I have not.

- Feb 25th 2014, 12:15 PMsakonpure6Re: Find U dot V
The dot vector http://www.mathsisfun.com/algebra/ve...t-product.html

This is the geometric dot vector because the definition has cos theta in it: $\displaystyle a \cdot b = |b| |a| cos \theta $

This is the algebraic dot vector, Let vector a=(x,y,z) b = (m,n,o) : $\displaystyle a \cdot b = (x,y,z) (m,n,o) \\= x*m + y*n + z*o $

Also you should note that the dot vector of any two vectors produces a*SCALAR.*

So provided the information and equation, can you solve the problem you have? - Feb 25th 2014, 03:47 PMProve ItRe: Find U dot V
- Feb 25th 2014, 04:55 PMsakonpure6Re: Find U dot V
Thanks for noticing that, I meant "dot product".