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When two lines intersect each other at right angles, they are perpendicular to each other.
 
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Here, \(\overline{AB}\) and \(\overline{CD}\) meet at right angles to each other. Therefore, \(\overline{AB}\) and \(\overline{CD}\) are perpendicular to each other.
 
When a perpendicular line divides another line into two halves, then it is called a perpendicular bisector.
 
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We know that \(\overline{AB}\) is perpendicular to \(\overline{CD}\). Also, \(AO = OB\).
 
Thus, \(\overline{CD}\) divides \(\overline{AB}\) into two halves.
 
Therefore, \(\overline{CD}\) is the perpendicular bisector of \(\overline{AB}\).