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ABCD are points on the circumference of a circle centre O. Angle BCD=130 degrees. Angle ABC=105 degrees. Angle OBC=anle ODC. Work out the size of angle ADO, marked x on the diagram.

Please help ABCD are points on the circumference of a circle centre O Angle BCD130 degrees Angle ABC105 degrees Angle OBCanle ODC Work out the size of angle ADO class=
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