A riddle is a thread of love, which expresses the connection of two people's hearts. You have me, and I have you, which corresponds to the connecting line in the field of mathematics, that is, connecting two round hearts together.

A connecting line is a straight line connecting the centers of two circles. If the center coordinates of two circles are known, the line equation can be expressed by a two-point formula, which passes through the centers of two circles that are not coincident on the plane. When two circles intersect, the connecting line is perpendicular to the common chord. The connecting line is the symmetry axis of two circles.

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