First use the distance formula to find the radius of the circle:
d=[tex] \sqrt{ ( x_{2}- x_{1}) ^{2}+ ( y_{2}- y_{1}) ^{2} } [/tex]
d=[tex] \sqrt{ (-1-23)^{2}+ (5--2)^{2} } [/tex]
d=[tex] \sqrt{ (-24)^{2}+ (7)^{2} } [/tex]
d=[tex] \sqrt{ (-24+7)^{2} } [/tex]
d=[tex] \sqrt{ (-17)^{2} } [/tex]
d=|17|
d=17
Next, find the equation of the circle (use the first picture):
(x+1)^2+(y-5)^2=17^2
Finally, input the equation into a graphing calculator:
(2nd picture)
