Equation of the circle , centred at the origin , whose radius equals the distance between the lines x = -1 and x = 1 , is

Find the equation of the circle with Centre at origin and radius 4

Find the equation of the circle with Centre at origin and radius 3

Equation of the circle with centre on the X-axis , radius 4 , and passing through the origin , is

Find the equation of the ellipse whose centre is at origin, the distance between foci is 2 and eccentricity is (1)/(sqrt(2)) .

Find the equation of the ellipse whose centre is at origin, the distance between foci is 2 and eccentricity is (1)/(sqrt(2)) .

Find the equation of the circle passing through the point (7, 3) having radius 3 units and whose centre lies on the line y = x-1

Equation of the tangent to the circle at the point (1, -1) whose centre is the point of intersection of the straight lines x-y=1 and 2x+y-3=0, is

Equation of the tangent to the circle at the point (1, -1) whose centre is the point of intersection of the straight lines x-y=1 and 2x+y-3=0, is