Geometry Segment Vocab

Point

Single location. It has no size or shape. Points can define locations in space and are fundamental in geometry.

Plane

A flat two-dimensional surface that extends infinitely in all directions. A plane is defined by three non-collinear points and contains infinitely many lines.

line segment

are parts of a line that connect two points or extend infinitely in one direction, respectively.

Rays

are parts of a line that start at one point and extend infinitely in one direction, defined by two points.

Parallel lines

are lines in a plane that never meet and are always the same distance apart.

Parallel Planes

are planes that never intersect, maintaining a constant distance apart from each other in space.

skew lines

are lines that do not intersect and are not parallel, existing in different planes.

Two lines intersect at a

point

A line and a plane intersect at a

point

Two planes intersect at a

line

Segment Addition Postulate

The segment addition postulate states that if point B lies on line segment AC, then the sum of the lengths of segments AB and BC equals the length of segment AC.

Segment Bisector

A segment bisector is a line, ray, or segment that divides a segment into two equal parts.

Midpoint of a Line Segment

The midpoint of a line segment is the point that divides the segment into two equal lengths, located exactly halfway between the endpoints.

Congruent Segments

Congruent segments are segments that have the same length, meaning they can be measured as equal when compared.