General formula of a line is ax+b=0
Similarly can we have a general formula of a circle ?
The general formula for a line in a plane is y=mx+c
The general formula for a circle in the x-y plane is x^2+y^2=r^2 (where r is the radius of the circle)
There's an even more general equation for a circle, one whose center is not located at the origin.
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