Determine whether tthe equation represent a circle,a point circle,has no graph

11.(x+8)2+ (y-4)2=0

12.(x+5)2+(y+3)2=12

13(x-12)2+y2=-6

14.(2x-1)2+(2y-3)2+5=0

15.x2+y2-22x+20y+201=0