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a,b - dowolne różne liczby rzeczywiste
Równanie okręgu ma postać:
(x - a)² + (y - b)² = r²
S = (a, b) r² = a² + b² - c > 0
x² + y² - 2ax - 2by +c = 0, gdzie: a² + b² - c = r²
x² + y² - ax + 2by - 0,75a² + 2ab = 0
x² - ax - 0,75a² + y² + 2by + 2ab = 0
(x - 0,5a)² - a² + (y + b)² - b² + 2ab = 0
(x - 0,5a)² + (y + b)² = a² - 2ab + b²
(x - 0,5a)² + (y + b)² = (a - b)²
S = ( 0,5a, - b)
r = a - b