If `(-1/3,-1)` is a centre of similitude for the circles `x^2+y^2=1` and `x^2+y^2-2x-6y-6=0`, then the length of common tangent of the circles is

If (2,6) is a centre fo similitude for the circle x^(2)+y^(2)=4 and x^(2)+y^(2)-2x-6y+9=0 , the length of the common tangent of circles through is

If P(1, 1//2) is a centre of similitude for the circles x^(2)+y^(2)+4x+2y-4=0 and x^(2)+y^(2)-4x-2y+4=0 , then the length of the common tangent through P to the circles, is

P(-1,-3) is a centre of similitude of for the two circles x^(2)+y^(2)=1 and x^(2)+y^(2)-2x-6y+6=0 . The length of the common tangent through P to the circles is

Consider the circles x^(2) + y^(2) = 1 & x^(2) + y^(2) – 2x – 6y + 6 = 0 . Then equation of a common tangent to the two circles is

The centre of similutude of the circles x^(2)+y^(2)-2x-6y+6=0, x^(2)+y^(2)=1 is

The centres of similutude of the circles x^(2)+y^(2)-2x-6y+6=0, x^(2)+y^(2)=1 is

The internal centre of similitude of the two circles x^(2)+y^(2)+6x-2y+1=0, x^(2)+y^(2)-2x-6y+9=0 is

The internal centre of similitude of the two circles x^(2)+y^(2)+6x-2y+1=0, x^(2)+y^(2)-2x-6y+9=0 is

The internal centre of similitude of the two circles x^(2)+y^(2)+6x-2y+1=0 , x^(2)+y^(2)-2x-6y+9=0 is

The two circles x^2 +y^2-2x+6y+6=0 and x^2 +y^2-5x+6y+15=0 touch each other. The equation of their common tangent is