In the figure, ABCD is a cyclic quadrilateral, if ∠ BAD = 110°, then ∠ BCD =
55°
140°
70°
110°
We know that the opposite angles of a cyclic quadrilateral are supplementary
∠ BAD + ∠ BCD = 180°,
then ∠ BCD = 180° - 110° = 70°
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