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Question
`square`ABCD is cyclic. If ∠B = 110°, then find measure of ∠D.
Solution
`square`ABCD is cyclic.
Opposite angles of a cyclic quadrilateral are supplementary.
∴ ∠B + ∠D = 180°
∴ 110° + ∠D = 180°
∴ ∠D = 180° − 110° = 70°
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