Q94 of 113 Page 128

Three lines AB, CD and EF intersect each other at O. If ∠AOE = 30° and ∠DOB = 40° (Fig. 5.51), find ∠COF.

∠AOE, ∠DOB and ∠ EOD forms a linear pair


∠AOE = 30°


∠DOB = 40°


∠ EOD = 1800-∠AOE- ∠DOB


⇒ ∠ EOD = 1100


∠COF = ∠ EOD = 1100( Vertically Opposite)


∠COF = 1100


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