If l parallel m parallel n and angle 1 60,find angle 2
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Answer:
As per the diagram.
∠1=∠3 [ Corresponding angles ] -----(1)
∠2=∠4 [ Vertically opposite angles ] -----(2)
Given
∠1=100o=∠3 [ from {1} ]
∠3+∠4=180o [ angles in a straight line ]
100+∠4=180o
∴∠4=80o
From 2
∠4=∠2=800
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