Answer:
I only did 1-16 but here:
11. x² + y² = 4
12. (x+3)² + (y-3)² = 1
13. x² + (y-3)² = 16
14. (x-7)² + (y+2)² = 4
15. x² + (y+20)² = 100
16. (x+4)² + (y+6)² = 16
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