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Adjacent Angles

Two lines AB ...

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Question 86

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.

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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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Adjacent Angles

Standard VII Mathematics

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