Are lines l and m parallel to each other in the following figure. Give reasons for your answer. plz help me , I don't know how to do it .
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No they aren't parallel.
The linear pair of 60° is 120°
How? angles in linear pair are supplimentary i.e their sim ks 180
So 180-60 = 120
For the lines to be parallel it should have to be 109° instead of 120° .
Therefore they are not parallel
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