Prove that the radi of the circles `x^2+y^2=1` , `x^2+y^2-2x-6y=6` and `x^2+y^2-4x-12y=9` are in arithmetic progression.

Prove that the radi of the circles x^(2)+y^(2)=1x^(2)+y^(2)-2x-6y=6 and x^(2)+y^(2)-4x-12y=9 are in arithmetic progression.

Prove that the radii of the circles x^(2)+y^(2)=1,x^(2)+y^(2)-2x-6y=6and x^(2)+y^(2)-4x-12y-9=0 are in arithmetic progression.

Prove that the radii of the circles x^(2)+y^(2)=1,x^(2)+y^(2)-2x-6y=6andx^(2)+y^(2)-4x-12y=9 are in AP.

Prove that the radii of the circles x^2 +y^2 = 4, 4x^2 + 4y^2 - 8x-24y+15=0 and x^2 + y^2 - 4y - 5 =0 are in arithmetic progression.

Radii of circles x^(2) + y^(2) = 1, x^(2) + y^(2) - 2x - 6y= 6 and x^(2) + y^(2) - 4x - 12y = 9 are in

Prove that the centres of the circles x^(2)+y^(2)=1,x^(2)+y^(2)+6x-2y-1=0 and x^(2)+y^(2)-12x+4y=1 are collinear

The radius of the circle x^(2) + y^(2) + 4x - 6y + 12 = 0 is

2.10 The radii of the circles x2 + y2 = 1, x2 + y2 – 2x – 6y = 6 and x2 + y2 - 4x - 12y = 9 are in(A)AP.(B)GP.(C) H.P.(D) None

The two circles x^(2)+y^(2)-2x-3=0 and x^(2)+y^(2)-4x-6y-8=0 are such that