7.1: Equations of Circles

(9, -3); r = 7

(9, 3); r = 7

(9, -3); r = 49

(-9, -3); r = 7

(-1, -2); r = 10

(-1, -2); r =  $\sqrt{10}$  

(1, 2); r = 10

(1, 2); r =  $\sqrt{10}$  

(3, 3); r = 3

(0, 0); r = 9

(0, 3); r = 3

(0, 0); r = 3

 $\left(x-3\right)^2=-8$  

 $\left(x+3\right)^2=17$  

 $\left(x+3\right)^2=1$  

 $\left(x-3\right)^2=8$  

 $\left(y+6\right)^2=9$  

 $\left(y+6\right)^2=27$  

 $\left(y-6\right)^2=45$  

 $\left(y-6\right)^2=27$  

(6, 0)

(-3, 4)

(4, -3)

(3, 4)

 $20$  

 $0$  

 $\sqrt{10}$  

 $\sqrt{20}$  

(0, 0)

(0, 3)

(3, 0)

(4, 5)