Find the equation of the circle concentric with the circle `x^2 + y^2 - 4x - 6y - 3 = 0` and which touches the y axis

Find the equation of the circle concentric with the circle x^(2) + y^(2) - 8x + 6y -5 = 0 and passing through the point (-2, -7).

Find the equation of the circle concentric with the circle x^2 +y^2 - 4x - 6y-9=0 and passing through the point (-4, -5)

Find the equation of the circle concentric with the circle 2x^2 + 2y^2 - 6x + 8y+1=0 and of double its area.

Find the equation of the circle which is concentric with the circle x^2 +y^2 - 4x+6y-3=0 and the double of its area.

(i) Find the equation of a circle concentric with the circle x^(2)+y^(2)-8x+6y-10=0 and passes through the point (-2,3). (ii) Find the equation of circle concentric with the circle x^(2)+y^(2)-4x-8y-6=0 and whose radius is three times the radius of this circle.

Equation of the circle concentric with the circle x^(2) + y^(2) + 8x + 10 y - 7 = 0 , and passing through the centre of the circle x^(2) + y^(2) - 4x - 6y = 0 ,is

Find the equation of a circle of radius 5 which lies within the circle x^2+y^2+14 x+10 y-26=0 and which touches the given circle at the point (-1,3)dot

Find the equation. of the circle concentric with the x^2 +y^2 + 4x-8y-6=0 and having radius double of its radius.

Find the equation of a circle concentric with the circle 2x^(2)+2y^(2)-6x+8y+1=0 and double of its area.

Find the equation of a circle with center (4, 3) touching the circle x^2+y^2=1