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r= akar (5-1)^2 + (-1-3)^2
r= akar 16 + 4
r= akar 25
r=5
(x-a)^2 + (y-b)^2 = r^2
(x-2)^2 + (y-3)^2 = 25
semoga membantu, jangan2 kita satu sekolah wwkkw