Find the coordinates of the centre and the radius of the circles whose equations are `4x^2 + 4y^2 - 16x - 12y + 21 = 0`.

Find the centre and radius of each of the circles whose equations are given below. (i) x^(2) + y^(2) - 4x - 8y -41 = 0

Find the centre and radius of each of the circles whose equations are given below. 3x^(2) + 3y^(2) - 6x - 12y - 1 =0 Find the radius and centre of the circle.

Find the centre and the radius of the circle. 2x^2+2y^2-4x+8y-4=0

Find the centre and radius of the following circles : 4x^2 + 4y^2 - 4x + 12y - 15 = 0

The coordinates of the centre and radius of the circle represented by the equation (3-2lambda)x^(2)+lambda y^(2)-4x+2y-4=0 are

The coordinates of the centre and radius of the circle represented by the equation (3-2lambda)x^(2)+lambda y^(2)-4x+2y-4=0 are

Find the centre and radius of the circles : x^2 + y^2 - 8x - 12y - 48=0

Find the centre and radius of the circles : x^2 + y^2 - 8x - 12y - 48=0

Find the centre and radius of the circles x^(2)+y^(2)-4x-8y-45,=0

Find the centre and radius of the circle 4x^(2) + 4y^(2) + 16y -4x = 19.