equation of a circle is: (x - h)² + (y - k)² = r² ; where (h,k) is the center and r is the radius.
In the given problem, (2, 4) is the center and 17 is the radius.
(x - 2)² + (y - 4)² = 17²
(x - 2)² + (y - 4)² =289
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