Q93 of 113 Page 128

In Fig. 5.50, OB is perpendicular to OA and ∠BOC = 49°. Find ∠AOD.

∠BOC = 49° (Given)


∠AOC = 900-490 = 410 (Complementary angles)


∠AOC and ∠AOD forms a linear pair


∠AOD = 1800-410 = 1390


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