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x² - 2ax + y² - 2by + c = 0
(x - a/2)² + a²/4 + (y - b/2)² + b²/4 +c = 0
(x - a/2)² + (y - b/2)² = -a²/4 - b²/4 -c
-a²/4 - b²/4 -c < 0
a² - b² -4c < 0
a² - b² < 4c
Równanie określa okrąg jeżeli a² - b² < 4c