For the circle passing through the origin and a (1.1), the length of the line segment cutting the ground on the x-axis is 3

For the circle passing through the origin and a (1.1), the length of the line segment cutting the ground on the x-axis is 3

Round (3,0) or (- 3,0)
Substituting three points into the circular equation (x-a) ^ 2 + (y-b) ^ 2 = R ^ 2
Solve the equations