If the equation represents a circle, then its radius is
Explanation for correct option
Step 1: Solve for the coefficients
Given equation is
For the general equation of the circle is the radius is
If is the coefficient of and is the coefficient of then for circle
Therefore the equation of the circle can be represented as
Now comparing with the general equation of the circle we get
Step 2: Solve for the radius of the given circle
Radius
Hence, Option (C) is correct