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On a straight railway track ST, a signal arm OR is raised at point O on the track. The arm makes an angle ROS = 144° with one part of the track.
Find angle ROT, the angle it makes with the other part of the track.

Class 9Linear Pair and Vertically Opposite AnglesGeometry — Lines and Angles
  • A36
  • B72
  • C40
  • D32

Step-by-Step Solution

Angles ROS and ROT form a linear pair (OR stands on line ST): angle ROT = 180 - 144 = 36°.
Answer: A) 36

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