Answer :
In Δ DOB and Δ AOC,
∠DOB = ∠AOC = 45° (vertically opposite angle)
∠OAC = ∠ODB (angles in the same segment)
∠OCA = ∠OBD (angles in the same segment)
Therefore, Δ DOB
Δ AOC by AA similarity,
Therefore, OC = OA.
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