# In Fig 8.116, if

Since,

l m and P is transversal

Therefore,

Given that,

l m n

1 = 60o

1 = 3 = 60o(Corresponding angles)

Now,

3 + 4 = 180o(Linear pair)

60o + 4 = 180o

4 = 120o

Also,

m n and P is the transversal

Therefore,

4 = 2 = 120o(Alternate interior angles)

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