Answer :

x^2+y^2-18x-2y+82=64 = (x-9)^2 + (y-1)^2 = 64 = 8^2

Center (9 , 1 )  radius = 8
x² + y² - 18x - 2y + 82 = 64
                             -82   -82
        x² + y² - 18x - 2y = -28

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