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pusat (a,b) = (2,3)
diameter = 8 cm
r = 4 cm
(x-a)^2 + (y-b)^2 = r^2
(x-2)^2 + (y-3)^2 = 4^2
x^2 - 4x + 4 + y^2 -6y +9 = 16
x^2 + y^2 - 4x - 6y -3 = 0