如图,四边形ABCD中,AD∥BC,∠ABC=∠BAD=90°,AB为⊙O的直径. (1)若AD=2,AB=BC=8,连接OC、OD. ①如图,四边形ABCD中,AD∥BC,∠ABC=∠BAD=90°,AB为⊙O的直径.(1)若AD=2,AB=BC=8,连接OC、OD.①求△COD的面积

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