# How to find if a vector is parallel to another

by dark_omen
Tags: parallel, vector
 HW Helper P: 3,224 How to find if a vector is parallel to another Think about the definition of the cross product, and see what happens. Btw, just use axb=$$det \left(\begin{array}{ccc}\vec{i} & \vec{j} & \vec{k}\\a_{1} & a_{2} & a_{3}\\b_{1} & b_{2} & b_{3}\end{array}\right)$$ for a=cb.