Q86Short answer
Two lines AB and CD intersect at O (Fig. 5.44). Write all the pairs of adjacent angles by taking angles 1, 2, 3, and 4 only. 15-04-2018 Fig. 5.44 Polygon Number of Sides Triangle 3 Quadrilateral 4 Pentagon 5 Hexagon 6 Heptagon 7 Octagon 8 n-gon n
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∠1, ∠2; ∠2, ∠3; ∠3, ∠4; ∠4, ∠1.