Q. 164.4( 5 Votes )
Two lines AB</ A. 70°
B. 80°
C. 90°
D. 180°
Answer :
Given that,
AB and CD intersect at O
∠AOC +∠COB +∠BOD = 270° (i)
∠COB + ∠BOD = 180o (Linear pair) (ii)
Using (ii) in (i), we get
∠AOC + 180o = 270o
∠AOC = 90o
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