(a) Consider the circle: (x+2)squared + (y-1)squared =9.
Find the center and radius of the circle.
(b) Consider the circles:
x squared + y squared + 4x-4y-1=0
x squared + y squared -2x+4y-4=0
(i) Find the center of each circle.
(ii) Find the distance between the centers if the circles are plotted on
the same rectangular coordinate axes.
This shows how to find center and radius of circles.