At the end of this activity, students should be able to place the circumference of the circle given by the equation (x û x0)2 + (y û y0)2 = r2 in the coordinate system, place the disc (x û x0)2 + (y û y0)2 ? r2 or (x û x0)2 + (y û y0)2< r2 in the coordinate system, represent the equation of the circle x2 + y2 û 2ax û 2by + c = 0 in the form (x û x0)2 + (y û y0)2= r2 and find the equation of a circle with three points given.

Originally released by Learnetic, 2016.