Which of the following equations represent a circle and if so, find its centre and radius:
`(x-5)^2 + (y+2)^2 = 0`.

In the following ,find the equation of the circle with:- centre (-2,3) and radius 4

Find the equations of the following curves in cartesian form. Wherever the curve is a circle, find its centre and radius : x= at^2, y=2at .

In the following ,find the equation of the circle with:-centre (0,2) and radius 2

Find the equations of the following curves in cartesian form. Wherever the curve is a circle, find its centre and radius : x=1+2 cos alpha, y=3+2 sin alpha .

Find the equations of the following curves in cartesian form. Wherever the curve is a circle, find its centre and radius : x= 1/2 t+1, y= 2t-1 .

In the following ,find the equation of the circle with:-centre (1,1) and radius sqrt2

Find the centre and radius of the circle : (x + 5)^2 + (y- 3)^2 = 36 .

Prove that the equation x^2 + y^2 + 2gx + 2fy + c = 0 represents a circle and find its centre and radius.