Equation of Any Circle

6. Graphing a Circle

Move the circle in the applet so that it is centered at (2,-1) and has a radius of 3.

7. Equation of This Circle

Use the same reasoning process you used for the unit circle to represent this circle in an equation--that is, set the distance between (x,y) and (2,-1) to 3 and then square both sides.

8. Equation of Any Circle

Write an equation for the circle centered at (h,k) with radius r.