please solve it quickly
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Step-by-step explanation:
In line AB,
<AOD+<DOB=180°. .....(1)
[by linear pair]
<AOD+<AOC=180°. .....(2)
[by linear pair]
from (1) & (2) , we get;
<AOD+<DOB=<AOD+<AOC
<DOB=<AOC
Hence, vertically opposite angles are equal.
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