The equation ofthe circle concentric with `x^2 + y^2 + 8x+12y + 15 = 0` and having y-intercept `8` units is

Find the equation of the circle concentric with the circle x ^2 + y ^2 - 8x + 12y + 15 = 0 and passing through the point (5, 4).

Write the equation of the unit circle concentric with x^2+y^2-8x+4y-8=0.

The equation of circle concentric with circle x^2+y^2-6x+ 12y+ 15=0 and double its area 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.

(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.

Equation of the circle concentric with x^(2)+y^(2)-8x-16y+4=0 and touches y- axis is

Find the equation of the circle concentric with the circle 2x^2+2y^2-8x+10y-39=0 and having its area 16pi sq.units

Find the equation of a circle concentric with the circle x^(2) + y^(2) - 6x + 12y + 15 = 0 and has double of its area.

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).