6 resources.
What direction cosines are and how to find them for a coordinate axis, a line through two points, or a line at given angles.
Writing a line's equation in vector and Cartesian form, given two points or a point and a parallel vector, with worked examples.
The equation of a coordinate plane, and finding a plane through the intersection of two others and a given point, with a worked example.
How to read a plane's intercepts on each axis straight from its equation, with a worked example.
How to find the angle between a line and a plane using their direction vector and normal vector, with a worked example.
The formula for the shortest distance between two skew lines in vector form, with two fully worked examples.