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The standard form of the equation of the circle with center
at (h,k) and radius r is
(x-h)² + (y-k)² = r²
Therefore,
the standard form of the equation of the circle with center
at (2,-7) and radius 5 is
(x-2)² + [y-(-7)]² = 5²
(x-2)² + (y+7)² = 25
Edwin