At one end \(A\) of a diameter \(AB\) of a circle of radius \(5 \ cm\), tangent \(XAY\) is drawn to the circle. Find the length of the chord \(CD\) parallel to \(XY\) and at a distance \(8 \ cm\) from \(A\).
\(OE=\) \(cm\)
\(EC=\) \(cm\)
Length of the chord \(=\) \(cm\)