JAMB - Mathematics (2013 - No. 41)
The locus of the points which is equidistant from the line PQ forms a
perpendicular line to PQ
circle centre P
circle centre Q
pair of parallel lines to PQ
Paskaidrojums
If you take any point that is equidistant from the line PQ, it lies at a constant distance above and below the line.
Therefore, the correct answer is: a pair of parallel lines to PQ.