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 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 - 3 = 0 and which touches the y axis

(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.

The eqaution of the circle concentric with x^(2) + y^(2) - 3x + 4y + c = 0 and passing through the point (-1,-2) is

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.

If a circle is concentric with the circle x^(2)+y^(2)-4x-6y+9=0 and passes through the point (-4,-5) then its equation is

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

Find the equation of the circle which is concentric with x^(2)+y^(2)+8x+12y+15=0 and passing through (2,3).

The equation of the circle concentric with x^(2)+y^(2)-6x+4y-3=0 and having radius 5 is