AS/A2 Pure 1 Pure 2

P3 Topic 2: Coordinate geometry in the (x, y) plane
Coordinate geometry of the circle
Use the interactive display below. Move the points and observe how the equation of the circle changes.

Please enable Java for an interactive construction (with Cinderella).

Summary The equation of a circle can be written as (x-a)2+(y-b)2 = r2 This circle has centre at (a,b) The circle has radius r Based on free Java applets from JavaMath