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

If the equation 3x^(2) + 3y^(2) + kxy + 9x + (k - 6) y + 3 = 0 represents a circle , then the radius of this circle is

Statement-1: The equation x^(2)-y^(2)-4x-4y=0 represents a circle with centre (2, 2) passing through the origin. Statement-2: The equation x^(2)+y^(2)+4x+6y+13=0 represents a point.

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

Show that the equation 3x^(2)+3y^(2)+6x-4y-1=0 represents a circle Find its centre and radius.

Show that the equaion x ^(2) + y ^(2) - 6x + 4y - 36 = 0 represents a circle. Also, find its centre and radius.

If 2x-4y=9 and 6x-12y+7=0 are parallel tangents to circle, then radius of the circle, is

Diameter of x^2+y^2-2x-6y+6=0 is chord of circle with center (2,1) then radius of bigger circle is

The equation x^(2)+y^(2)+4x+6y+13=0 represents