Suppose you have a circle with center (h, k) and radius r. Write an equation that would allow you to test whether a particular point (x, y) is on the circle.

Write the standard form of the equation of the circle with center (2,1) that also contains the point (2,2).

Is the point (0,8) on the x-axis or y-axis? How do you know?

Use the Midpoint Formula to find the midpoint of the line segments whose endpoints are (2,5) and (6,1) . Plot the endpoints and the midpoint on a rectangular coordinate system.