how to solve this problem
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we know that, opposite angle are congruent.
if,BOD=40°
then,
AOC=40° [ as they are opposite angle ]
AOD= 160° [ AOD+BOD=180° →AOD+40°=180°→AOD=180°-40°→160°]
if,AOD =160°, then BOC=160° [ as they are opposite angle]
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