Find the equation of the circle if the chord of the circle joining (1, 2) and `(-3,1)` subtents `90^0` at the center of the circle.

The equation of the circle C with center at (√3,1) is

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

The equation of the circle whose diameter is common chord to the circles

Find the equation of the circle with: centre (0,-1) and radius 1.

Find the equation of the circle when the end points of a diameter of the circle are : (2, 3) and (-1, -3)

Find the equation of a circle with center (4,3) touching the circle x^(2)+y^(2)=1

Find the equation of the circle in which the chord joining the points (a,b) and (b,-a) subtends an angle of 45^(@) at any point on the circumference of the circle.

Find the equation of the chord of the circle x^(2)+y^(2)=9 whose middle point is (1,-2)

Determine equation of the circle whose diameter is the chord x+y=1 of the circle x^(2)+y^(2)=4