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Question

In Figure, line lm, 1=120 and 2=100, find out 3 and 4.


  1. 3=80, 4=60
  2. 3=40, 4=80
  3. 3=80, 4=40
  4. 3=60, 4=80


Solution

The correct option is C 3=80, 4=40
Given that 1=120 and 2=100
1 and 5 a linear pair
=1+5=180=5=180120=5=60
Therefore, 5=60 
2 and 6 are corresponding angles
=2=6=100
Therefore, 6=100
6 and 3 a linear pair
=6+3=180=3=180100
=3=80
Therefore, 3=80
By angles of sum property
=3+5+4=180
=4=1808060=4=40
Therefore, 4=40

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