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x² + y² - 2x - 2y - 14 = 0
x² - 2x + y² - 2y = 14
(x²-2x+1) + (y²-2y+1) = 14+1+1
(x-1)² + (y-1)² = 16
Pusat lingkaran A: (1,1)
Pusat lingkaran B: (2,5)
Jarak pusat A dan B = 5 satuan
Jari-jari lingkaran A = 4
Jari-jari lingkaran B = 1
Karena r₁+r₂ = d
Maka kedua lingkaran tersebut bersinggungan [B]