Mathematics

Two lines $$AB$$ and $$CD$$ intersect at $$O$$ Fig. Write all the pairs of adjacent angles by taking angles $$1,\ 2,\ 3,\ $$ and $$4$$ only.


SOLUTION
There are four pair of adjacent angles are formed:
$$\angle 1$$ and $$\angle 2, \angle 1$$ and $$\angle 4, \angle 2$$ and $$ \angle 3, \angle 3$$ and $$\angle 4$$.
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