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On the set of all lines in a plane, (lRm) if and only if (l) and (m) have the same direction. What do the equivalence classes represent?

Answer and explanation

Correct answer: Groups of all lines with the same direction

Step 1: A line has the same direction as itself, so the relation is reflexive. Step 2: Same direction is mutual and remains consistent through a third line. Step 3: Hence each equivalence class contains lines with one fixed direction, not necessarily lines through one point.

Related tags

LinesSame DirectionEquivalence ClassesGeometry RelationEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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