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i) As we can observe, angle COD is a right angle. it is placed on a straight angle AOB. Thus, removing angle COD from the straight angle and combining angles AOD and BOC will give us a right angle. Thus angles AOD and BOC are complementary.
ii) We can observe in the given figure that angle AOC is an obtuse angle and angle BOC is an acute angle. when placed with the common ray as OC, we can see the formation of a straight angle AOB. Hence, angles AOC and BOC are supplementary angles.
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