Basic Geometry Terms

Front

Point

Back

A location in space, represented by a dot and has no dimension (no length, width, or height).

Front

Line

Back

A straight one-dimensional consisting of at least two points, extending infinitely in both directions.

Front

Plane

Back

A flat, two-dimensional surface that contains at least three points and extends infinitely in all directions.

Front

Line Segment

Back

A part of a line with two endpoints.

Front

Endpoints

Back

The points at the ends of a line segment or the starting point of a ray.

Front

Ray

Back

A part of a line that starts at one point and extends infinitely in one direction.

Front

Opposite Rays

Back

Two rays that share an endpoint and extend in opposite directions to form a line.

Front

Postulate

Back

A statement accepted as true without proof, used as a basis for reasoning.

Front

Axiom

Back

A universally accepted principle in mathematics.

Front

Congruent Segments

Back

Segments that have the same length.