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Question
Two lines AB and CD intersect at O (see the figure). Write all the pairs of adjacent angles by taking angles 1, 2, 3, and 4 only.
Numerical
Solution
Two angles are called adjacent angles, if they have a common vertex and a common arm, but no common interior points.
Hence, following are the pairs of adjacent angles taking 1, 2, 3, 4 angles only, i.e. ∠1, ∠2; ∠2, ∠3; ∠3, ∠4; ∠4, ∠1.
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