The radius of the circle X^2 + y^2 +2gx + 2fy + c = 0 is? - IQ786

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The radius of the circle X^2 + y^2 +2gx + 2fy + c = 0 is?

The radius of the circle X^2 + y^2 +2gx + 2fy + c = 0 is?

Explanation