2D Direction Vector

A vector that denotes the ‘slope’ of a vector. It is usually added to a 2D Position Vector to show that it continues. If 2 Vector Equation have the same direction vector, then they are parallel

Perpendicular Direction Vector

To find the perpendicular direction vector:

1. Flip the x and y components
2. Make x component negative $\vec{r}=[3,2]$ $\perp \vec{r}=[-2,3]$ Confirm with Dot Product The components $x$ and $y$ of this perpendicular vector corresponds to the coefficients $a$ and $b$ in Standard Form of your regular vector.