Geometrical significance of constant c in general equation of circle

[kunalchanda123]

Can anybody help me in explaining the Geometrical significance of constant c in general equation of circle
x^2 +y^2 +2gx + 2fy + c = 0?

 

[Deleted member 4993]

Can anybody help me in explaining the Geometrical significance of constant c in general equation of circle
x^2 +y^2 +2gx + 2fy + c = 0?

Hint:

x^2 +y^2 +2gx + 2fy + c = 0

(x + g)² + (y + f)² -(g² + f² - c) = 0

Compare the above equation with equation of a circle.....