Find the centre and radius of each of the following circle: `x^2+y^2-x+2y-3=0`

Find the centre and radius of each of the following circle: x^2+y^2-4x+6y=5

Find the centre and radius of each of the following circle: (x-1)^2+y^2=4

Find the coordinates of the centre and radius of each of the following circle: x^2+y^2-a x-b y=0

Find the centre and radius of each of the following circle: (x+5)^2+(y+1)^2=9

Find the coordinates of the centre and radius of each of the following circle: 2x^2+2y^2-3x+5y=7

Find the coordinates of the centre and radius of each of the following circle: x^2+y^2+6x-8y-24=0

Find the centre and radius of each of the following circle : (i) x^(2)+y^(2)+4x-4y+1=0 (ii) 2x^(2)+2y^(2)-6x+6y+1=0 (iii) 2x^(2)+2y^(2)=3k(x+k) (iv) 3x^(2)+3y^(2)-5x-6y+4=0 (v) x^(2)+y^(2)-2ax-2by+a^(2)=0

Find the coordinates of the centre and radius of each of the following circle: 1/2(x^2+y^2)+x costheta+y\ sintheta-4=0

Find the centre and radius of each of that circles : x^2 + (y-1)^2 =2

Find the centre and radius of each of that circles : x^2 + y^2 - 2x + 4y =8