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maka r kuadrat (r^2) = 5^2
persamaannya adalah
(X-a)^2 + (Y-b)^2 = r^2
(X+5)^2 + (Y+2)^2 = 5^2 (dalam bentuk baku)
(X+5)^2 + (Y+2)^2 = 25
X^2 + 10X + 25 + Y^2 + 4Y + 4 = 25
X^2 + Y^2 +10X + 4Y +25 +4 - 25 = 0
X^2 + Y^2 + 10X + 4Y +4 = 0 (dalam bentuk umum)