Let L denote the set of all straight lines in a plane. Let a relation R be l R m if l is perpendicular to m ∀ l, m ∈ L. Then R is:

Let L denote the set of all straight lines in a plane. Let a relation

1.	Let L denote the set of all straight lines in a plane. Let a relation R be l R m if l is perpendicular to m ∀ l, m ∈ L. Then R is:
A.	reflexive
B.	symmetric
C.	transitive
D.	equivalence
Answer» C. transitive

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