If `x^(2)+y^2-4x+6y+c=0`represents a circle with radius 6 then c is

If x^(2)+y^(2)-4x+6y+c=0 represents a circle of radius 5 then c=

If x^(2) +y^(2) -4x + 6y + c = 0 represents a circle with radius 6 then find the value of c.

If 2x^(2)+by^(2)+4x-6y-1=0 represents a circle, then b=

If 2x^2+lambdaxy+2y^2 +(lambda-4)x + 6y-5=0 represents a circle, then its radius is:

If the equation 2x^2-2xy-y^2-6x+6y+c=0 represents a pair of lines then c=

If the circle x^(2) + y^(2) + 4x - 6y - c = 0 bissects the circumference of the circle x^(2) + y^(2) - 6x + 4y - 12 = 0 , then c =

If the circle x^(2)+y^(2)-4x+6y+a = 0 has radius 4 then find a.

If one of the diameters of the curve x^2+y^2-4x-6y+9=0 is a chord of a circle with centre (1,1), then the radius of this circle is