Question

If l parallel m parallel n and angle 1 60,find angle 2

Answer 1

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