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[" Section (D): Position of two circle,Orthogonality,Radical axis and radical centre "],[" D-1.Find the equations to the common tangents of the circles "x^(2)+y^(2)-2x-6y+9=0" and "],[x^(2)+y^(2)+6x-2y+1=0],[" D- "2" .Show that the circles "x^(2)+y^(2)-2x-6y-12=0" and "x^(2)+y^(2)+6x+4y-6=0" cut each other orthogonally."]

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Find the number of common tangents of the circles x^2+y^2-2x-6y+9=0 and x^2+y^2+6x-2y+1=0

Find the equation of the radical axis of the circles x^(2)+y^(2)-4x+6y-7=0,4(x^(2)+y^(2))+8x+12y-9=0

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