Entering Vectors
Vectors can be created using the Vector or Vector from Point tools in the third
menu.
Vector joins two points A and B with the vector AB.
Vector from Point will translate an existing vector so that it starts from a point.
Alternatively enter a set of coordinates with a lower-case name will create the object as a position vector, e.g. v=(2,3,-1)
Line[A,v] will create a a line through point A in the direction v.
Planes can be entered directly in Cartesian form: e.g. 2x+3y-z=2.