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(i) Yes, 1 is adjacent to 2 as:

Both the angles have common vertex O

Also,

Both the angles have a common arm OC

Also,

The non – common arms of both the angles i.e., OA and OC are on either side of the common arm

(ii) No, AOC is not adjacent to AOE as:

Both the angles have common vertex O

Also,

Both the angles have a common arm OA

But,

The non – common arms of both the angles i.e. OC and OE are on the same side of the common arm

(iii) Yes, COE and EOD form a linear pair because:

Both the angles have common vertex O

Also,

Both the angles have a common arm OE

Also,

The non – common arms of both the angles i.e., OC and OD are opposite rays

(iv) Yes, BOD and DOA are supplementary because:

Both the angles have common vertex O

Also,

The non – common arms of both the angles are opposite to each other

(v) Yes, 1 and 2 are vertically opposite to each other because:

These angles are formed due to the intersection o two straight lines i.e., AB and CD

(vi) COB is the vertically opposite angle of 5 because these are formed due to the intersection of two straight lines i.e., AB and CD

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