[" 13.उस वृत्त का समोकरण जात करें जो "x^(2)+y^(2)+8x+10y-7=0" के केंड "],[qquad 2x^(2)+2y^(2)-8x-12y-9=0" के साय संकेड्रीय है। "]

The two circles x^(2)+y^(2)-2x-2y-7=0 and 3(x^(2)+y^(2))-8x+29y=0

The two circles x^(2)+y^(2)-2x-2y-7=0 and 3(x^(2)+y^(2))-8x+29y=0

Two circles x^(2) + y^(2) - 4x + 10y + 20 = 0 and x^(2) + y^(2) + 8x - 6y - 24= 0

I. X^(2) - 8x+15 = 0" "II. Y^(2) -12y + 36 = 0

The circles x^(2)+y^(2)-8x+6y+21=0, x^(2)+y^(2)+4x=10y-115=0 are

The power ofthe centre of x^(2)+y^(2)-8x+4y-10=0 with respect to 5x^(2)+5y^(2)+4x+2y-1=0 is

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

(i) Find the equation of a circle , which is concentric with the circle x^(2) + y^(2) - 6x + 12y + 15 = 0 and of double its radius. (ii) Find the equation of a circle , which is concentric with the circle x^(2) + y^(2) - 2x - 4y + 1 = 0 and whose radius is 5. (iii) Find the equation of the cricle concentric with x^(2) + y^(2) - 4x - 6y - 3 = 0 and which touches the y-axis. (iv) find the equation of a circle passing through the centre of the circle x^(2) + y^(2) + 8x + 10y - 7 = 0 and concentric with the circle 2x^(2) + 2y^(2) - 8x - 12y - 9 = 0 . (v) Find the equation of the circle concentric with the circle x^(2) + y^(2) + 4x - 8y - 6 = 0 and having radius double of its radius.

Find the equation of the circle which passes through the centre of the circle x^(2)+y^(2)+8x+10y-7=0 and is concentric with the circle 2x^(2)+2y^(2)-8x-12y-9=0