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Memberikan persamaan lingkaran:
(x - xp)^2 + (y - yp)^2 = r^2
(x-(-3))^2 + (y-4)^2 = (2 akar(2))^2
(x+3)^2 + (y-4)^2 = 2^2 x akar(2)^2
(x+3)^2 + (y-4)^2 = 4 x 2
(x+3)^2 + (y-4)^2 = 8
Atau dalam bentuk lain:
0 = (x+3)^2 + (y-4)^2 - 8
0 = x^2 + 6x + 9 + y^2 - 8y + 16 - 8
0 = x^2 + y^2 + 6x - 8y + 17