The standard equation of a circle of radius R an center at (A, B) is:
[tex](x-A)^2+(y-B)^2=R^2[/tex]
The coordinates of the center and the radius of every circle can be seen in the graphs:
a) Center: (0,0); Radius: 5; Equation: [tex]x^2+y^2=5^2[/tex]
b) Center: (6,4); Radius: 3; Equation: [tex](x-6)^2+(y-4)^2=3^2[/tex]
c) Center: (4,3); Radius: 5; Equation: [tex](x-4)^2+(y-3)^2=5^2[/tex]
