# Math Help - Vectors

1. ## Vectors

Find u times v if ||u|| = 10, ||v|| = 25, and the angle between u and v is pi/6

2. ## Scalar Product

Hello jordangiscool
Originally Posted by jordangiscool
Find u times v if ||u|| = 10, ||v|| = 25, and the angle between u and v is pi/6
I assume you mean the scalar, or dot, product of the vectors. In which case, you need the formula

$\vec{u}.\vec{v} = |\vec{u}||\vec{v}|\cos\theta$, where $\theta$ is the angle between the vectors.

$|\vec{u}|=10,|\vec{v}|=25,\cos(\tfrac{\pi}{6})= \frac{\sqrt3}{2}$, so ...

You finish up.