A midpoint is a point. It's the point exactly halfway between the ends
of a line segment.
A perpendicular bisector is a line. It's the line that passes through the
midpoint of the segment, and is perpendicular to the segment.
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An angle bisector bisects an angle. A perpendicular bisector bisects a side.
A perpendicular segment refers to a line that cuts another at right angle (90 deg). A perpendicular bisector refers to a line that cuts another at right angle while splitting the two sides equally. In short, it is just a 90 degree line in the midpoint (exact centre) of the other line
90 degrees
The midpoint is a point. A bisector is a line. The midpoint defined by its location in space as equally distant from the two other points on a line. A bisector is line defined by at least two points in space one of which is the midpoint as defined earlier. The midpoint is a point on a bisector. http://en.wikipedia.org/wiki/Bisection In addition to line segments, bisectors there are also bisectors for 2 dimentional objects such as angles. http://mathworld.wolfram.com/AngleBisector.html Out side the formalism of Geometry, any measurement has a midpoint: length, mass, tempurature, time, etc. 'Bisect' is used less frequently outside geometry. A person can take a 2 hour journey from one place to another covering 50 miles. The journey consisted of many turns on a map. The transportation was part by bicycle and part by train. You could use the term midpoint of the journey as either the 1 hour point or the 25 mile point depending on personal preference to measure your journey. You probably wouldn't apply the term 'bisection' of a journey unless you wanted to confuse those around you.
This line is called the midpoint of the segment. It is located exactly halfway between the endpoints of the segment, dividing it into two equal segments.