A circle is one of the most familiar geometrical figures and has been around a long time! In this brief Section we discuss the basic coordinate geometry of a circle - in particular the basic equation representing a circle in terms of its centre and radius.
- understand what is meant by a function and be able to use functional notation
- be able to plot graphs of functions
- obtain the equation of any given circle
- obtain the centre and radius of a circle from its equation
1.1 Circles with centre at the origin
1.2 Circles and functions
2 Annuli between circles