Unit 1: Points, Lines and Planes Vocabulary
plane
A flat surface that goes on forever in two directions; an infinite set of points; it has no thickness and is two dimensional.
segment bisector
A line that divides a segment at its midpoint to form two congruent segments.
perpendicular bisector
A line that passes through the midpoint of a segment and is perpendicular to that segment.
midpoint
A point that divides a segment into two congruent segments.
line
An infinite set of points that goes on forever; it has no thickness and it is one dimensional.
point
It marks a location and is named by a capital letter; it has no thickness and 0 dimension.
skew
Lines that are not parallel and do not intersect.
parallel
Lines that do not intersect but are in the same plane.
endpoint
Marks the end of a line segment or ray.
segment
Part of a line consisting of two end points and all the points between them.
ray
Part of a line that starts at a particular point and extends infinitely in one direction.
noncollinear
Points that do not lie on the same line.
noncoplanar
Points that do not lie on the same plane.
collinear
Points that lie on the same line.
coplanar
Points that lie on the same plane.
congruent segments
Segments that have the same length.
space
The set of all points. It is three dimensional.
intersection
The set of points both figures have in common.
intersecting lines
Two lines that cross at a given point.
perpendicular
Two lines that intersect to form right angles.
opposite rays
Two rays that share a common endpoint but extends in opposite directions and makes a line.