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In a quadrilateal ABCD, CO and DO are the bisectors of ∠C and ∠D respectively. Prove that ∠COD =12 (∠A + ∠B).

Answer» In a quadrilateal ABCD, CO and DO are the bisectors of ∠C and ∠D respectively. Prove that ∠COD =12 (∠A + ∠B).


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