(a) The equation of circle is given as,
The graph of the given circle is,
Center = (0,0)
Radius = 4.5 units
(b) The equation of circle is given as,
The graph of the given circle is,
Center = (0,0)
Radius = 8.67 units
(c) The equation of circle is given as,
The graph of the given circle is,
Center = (3,0)
Radius = 1 unit
(d) The equation of circle is given as,