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Lines in a plane: 'L1 is perpendicular to L2' is
ATransitive and symmetric, not reflexive
BAn equivalence relation on all lines
CReflexive and symmetric, not transitive
DSymmetric but not reflexive or transitive
Answer & Solution
Correct answer: D. Symmetric but not reflexive or transitive
A line is not perpendicular to itself, and if L1 is perpendicular to L2 and L2 to L3 then L1 is parallel to L3, yet perpendicularity is symmetric.
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