Final answer:
A perpendicular bisector divides a line into two equal parts at a 90° angle by intersecting the line at its midpoint and forming two right angles with it.
Step-by-step explanation:
The term perpendicular bisector refers to a line that divides another line into two equal parts at a 90° angle. Imagine you have a line segment, and you want to find its midpoint. Once you have the midpoint, you draw a line through it that forms two right angles with the original line segment. This is your perpendicular bisector. Each section of the original line on either side of the perpendicular bisector is congruent, meaning the two parts are of equal length. This property is crucial in various geometrical constructions and proofs.