Q. 165.0( 4 Votes )
In the given figure, straight lines AB and CD intersect at O. If ∠AOC = ϕ, ∠BOC = θ and θ = 3θ, then θ = ?

A. 30°
B. 40°
C. 45°
D. 60°
Answer :
As we know that sum of all angles on a straight line is 180o.
According to question,
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