A ray, line or segment that divides a segment into two parts of equal measure is called

• A. Midpoint
• B. Angle Bisector
• C. Segment Bisector
• D. Perpendicular Bisector

Answer: (C)

A segment bisector is the term for a ray, line, or segment that cuts another segment into two equal parts. Here, the dividing object is not just the point where the split occurs (that point is the midpoint), but the line, ray, or segment that passes through that midpoint to create the two equal-length pieces. The midpoint itself is the location of equality, while the segment bisector is the entity that accomplishes the division. The other terms don’t fit: a midpoint is a point, not a dividing object; an angle bisector applies to angles; a perpendicular bisector would require the divider to be perpendicular to the segment, which isn’t specified here.