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r = 3
r = √(1/4A^2 + 1/4B^2 - C)
9 = 1/4(2p)^2 + 1/4(36) - 4
9 = 1/4 x 4p^2 + 5
4 = p^2
p = 2
pers lingkaran
x2 + y2 + 4x + 6y + 4 = 0
pusat = (-1/2A,-1/2B) = (-2,-3)