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Question

If AOB is a straight line and BOC=120, then x=_________. 
  1. 180
  2. 60
  3. 270
  4. 180


Solution

The correct option is B 60
Given: AOB is a straight line.
A Linear pair is a pair of adjacent angles where the non-common sides form a straight line.
Here, AOC and BOC form a linear pair.
We know that sum of angles of a linear pair = 180.
Hence, AOCBOC180
x+120180
x=180120
x=60

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