The circles `x^2+y^2-12 x-12 y=0` and `x^2+y^2+6x+6y=0.` touch each other externally touch each other internally intersect at two points none of these

The circles x^(2)+y^(2)+2x-2y+1=0 and x^(2)+y^(2)-2x-2y+1=0 touch each other

Examine whether the two circles x^2+y^2-2x-4y=0 and x^2+y^2-8y-4=0 touch each other externally or internally .

The circles x^(2)+y^(2)-12x-12y=0 and x^(2)+y^(2)+6x+6y=0:( a) intersect in two points.(b) touch each other externally.(c) touch each other internally.(d) None of these

Two circles x^(2) + y^(2) -2kx = 0 and x^(2) + y^(2) - 4x + 8y + 16 = 0 touch each other externally.Then k is

The two circles x^(2)+y^(2)-cx=0 and x^(2)+y^(2)=4 touch each other if:

Two circles x^2 + y^2 + 2x-4y=0 and x^2 + y^2 - 8y - 4 = 0 (A) touch each other externally (B) intersect each other (C) touch each other internally (D) none of these