AB is the diameter. CD is parallel to AB​. if AB = 8 and BC = 2. Find the length of CD

Dear student
AB=8 unitsClearly, OA=OB=OC=OD=AB2=82=4 unitsIn OCD, OC=OD=4 unitsSo, ODC=OCD   [Angles opp. to equal sides are equal]Information is insufficient to find the length of CD.
Regards

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