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B
92∘
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C
95∘
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Solution
By linear pair property, ∠DCB=87∘
Now, by angle sum property of a quadrilateral, we must have, x=360∘−(95∘+87∘+87∘)=91∘
By linear pair property, ∠DCB=75∘ and ∠ABC=100∘
Now, by angle sum property of a quadrilateral, we must have, x=360∘−(75∘+100∘+90∘)=95∘
By angle sum property of a quadrilateral, we must have, x=360∘−(87∘+88∘+93∘)=92∘