Question

let R be a relation on the set of all lines in a plane defined by xRy if and only if x is perpendicular to y
(i)If L1 R L2,Is it true that L2 R L1?
(ii)If L1 R L2,L2 R L3.Is it true that L1 R L3?
HERE 'R' REPRESENTS RELATION

Answer 1

IF L1RL2 then L2RL1 because both lines will be perpendicular to each other