A circle is all points in a plane that are a fixed distance from a fixed point in the plane. C2 Edexcel June 2012 Q3 a b Example. X h 2 y k 2 r.
The formula is x h 2 y k 2 r 2.
D x2 x12 y2 y12 All you have to do is plug in the given points given to the distance formula and solve. X h 2 y k 2 r 2. The formula is x h 2 y k 2 r 2. The circle is centered at the origin and has a radius 6.