"Let `O` be the origin. We define a relation between two   points `P` and `Q` in a plane
Channel: Doubtnut
Date: 2020-06-28

"Let `O`
 be the origin. We define a relation between two
 
  points `P`
 and `Q`
 in a plane if `O P=O Q`
 . Show that the relation, so defined is an
 
  equivalence relation."