Elementary Geometry

Geometry Level 2

In the above figure, \(O\) is the center of circle. Angle \(AOB = 90^\circ\). The line \(AC\) is parallel to \(OD\). \(OB\)'s length is equal to twenty centimeters. \(BD\)'s length is equal to four centimeters. Determine the length of \(AB\).

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