JAMB - Mathematics (2000 - No. 22)
if P and Q are fixed points and X is a point which moves so that XP = XQ, the locus of X is
A straight line
a circle
the bisector of angle PXQ
the perpendicular bisector of PQ
Explication
A perpendicular bisector always divides a line segment through its midpoint. The term bisect itself means dividing equally or uniformly.