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saat y= 2, maka x= 8 - 2.2
x= 4
pers lingkaran titik pusat (4,2):
(x-x₀)² + (y-y₀)² = r²
(x-4)² + (y-2)² = 4
saat y= -2, maka x= 8 - 2.(-2)
x= 12
pers lingkaran titik pusat (12,-2):
(x-x₀)² + (y-y₀)² = r²
(x-12)² + (y+2)² = 4