Essential revision or learning for a wealth of disciplines like architecture, physics, engineering or design. Understanding the qualities of circles, lines and cones together with a thorough explanation of vectors, provide an excellent foundation to further study.

# Properties of straight line segments

In this unit a system of co-ordinates is described, and is used to find various properties of the straight line between two points. The distance between the two points and the mid-point of the line joining the two points are calculated. Video tutorial 27 mins.