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18. Though AB and CD are two straight lines and OP and OQ are the bisectors of angleBOD and AOC ,
two opposite angles are equal
So their bisector lines are in straight line.
19. Here, AB and CD intersect each other
: BOC and AOD are opposite equal angles
Since POQ is a STRAiGHT line and OP bisects angle AOD,
So OQ bisects BOD (proved)
Hope this was helpful for you buddy
Pls mark it brainliest
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