Question

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Answer 1

Step-by-step explanation:

Solution is given in the above pic

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Answer 2

Answer:

First ∆DOC and ∆AOB are vertically opposite angle so they have same vertex so, ∆DOC = ∆AOB.

∆DCB and ∆ACB are in linear pair hence, they are adjacent angles so, ∆DCB=∆ACB.

DA is parallel to CB because all the angles are equal to each other.

Hence,proves