In ABCD tetrahedron angle A=100°,angleB=110° then angle DOC is equal to
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ANSWER _Given □ABCD is cyclic and ∠B=110 ∘
In a cyclic quadrilateral the sum of opposite angles=180 ∘
⇒∠A+∠C=180 ∘
⇒∠B+∠D=180 ∘
⇒110 ∘ +∠D=180 ∘
⇒∠D=180 ∘ −110 ∘
⇒∠D=70 ∘
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