Write the equation of a circle having centre at (a,b) and radius 'r'.

Find the equation of the circle with centre (-a,-b) and radius sqrt(a^2+b^2) .

Find the equation of the circle with centre (-a,-b) and radius sqrt(a^2-b^2)

Find the equation of the circle with centre (1,1) and radius sqrt2

Find the equation of the circle whose centre is at (-3,-2) and radius equal to 7 .

Find an equation of the circle with centre at (0,0) and radius 2.

Find the equation of the circle with centre (-3,2) and radius 4 .

find the equation of the circle with Centre (-a,-b) and radius sqrt(a^2-b^2)

By eliminating 'a' and 'b' from the equation of circle with center (a,b) and radius r. form the differential equation corresponding to the family.

Find the equation of the circle with Centre (1,1) and radius sqrt2 .

Find the equation of the circle with (a) centre (0,2) and radius 2 (b) centre (-2,3) and radius 4