The most intuitive way to consider curved space is to think about the behaviour of straight lines in this space. In flat Euclidean space, two parallel lines are always a constant distance apart. In ...

Skew lines, the shortest distance between them and its equation. Equations of a line and a plane in different forms, intersection of a line and a plane, coplanar lines. Unit 13: Vector algebra ...

Equation of a plane in different forms, the intersection of a line and a plane, coplanar lines (from Unit 12: Three Dimensional Geometry) Scalar and vector triple product (from Unit 13: Vector ...