6 Vector applications
6A Area (3D vectors)
6B Lines in 2 and 3 dimensions
6C The angle between two lines
6D Constant velocity problems
6E The shortest distance from a point to a line
6F Intersecting lines
6G Relationships between lines
6H Planes
6I Angles in space
6J Solving 3x3 linear systems
6K Intersecting planes
