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[x^(2)+y^(2)-6x+12y+15=0" and of double ...

[x^(2)+y^(2)-6x+12y+15=0" and of double its area."],[[" 13.Prove that the centres of the three circles "x^(2)+y^(2)-4x-6y-12=0],[x^(2)+y^(2)+2x+4y-5=0" and "x^(2)+y^(2)-10x-16y+7=0" are collinear."]]

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Prove that the centres of the three circles x^(2)+y^(2)-4x6y12=0,x^(2)+y^(2)+2x+4y-5=0 and x^(2)+y^(2)-10x16y+7=0 are collinear.

Prove that the centres of the three circles : x^2 + y^2 -4x-6y-14=0, x^2 + y^2+ 2x+4y-5=0 and x^2 + y^2-10x -16y + 7 = 0 are collinear.

Prove that the centres of the three circles x^(2) + y^(2) - 2x + 6y + 1 = 0, x^(2) + y^(2) + 4x - 12y + 9 = 0 and x^(2) + y^(2) - 16 = 0 are collinear.

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 centres of the three circles x^(2)+y^(2)-10x+9=0,x^(2)+y^(2)-6x+2y+1=0,x^(2)+y^(2)-9x-4y+2=0

The centres of the three circles x^(2)+y^(2)-10x+9=0, x^(2)+y^(2)-6x+2y+1=0, x^(2)+y^(2)-9x-4y+2=0 lie on the line

The circles x^(2)+y^(2)+6x+6y=0 and x^(2)+y^(2)-12x-12y=0

The centre of circle cutting the three circles x^(2)+y^(2)-4x-4y+5=0 , x^(2)+y^(2)-4x-6y+5=0 , x^(2)+y^(2)-4x-8y+5=0 orthogonally is

The equation of the circle which cuts the three circles x^(2)+y^(2)-4x-6y+4=0 , x^(2)+y^(2)-2x-8y+4=0 and x^(2)+y^(2)-6x-6y+4=0 orthogonally is