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

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)-ax-by=0

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

Find the coordinates of the centre and radius of each of the following circle: (1)/(2)(x^(2)+y^(2))+x cos theta+ys int h eta-4=0

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: (x-1)^2+y^2=4

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