Basic Geometry Terms

Front

Lines in the same plane that do not intersect.

Back

Parallel Lines

Front

An undefined term in Geometry. A specific location. It has no dimension and is represented by a dot.

Back

Point

Front

Points or lines all in one plane.

Back

Coplanar

Front

Three or more points not all of which lie on the same line.

Back

Non-Collinear

Front

A portion of a line that starts at a point (the endpoint) and continues forever in one direction.

Back

Ray

Front

A straight path that extends infinitely in both directions and has no endpoints.

Back

Line

Front

A line that divides an angle into two equal parts.

Back

Angle Bisector

Front

A set of points that are all on the same line.

Back

Collinear

Front

Two lines that intersect at a right angle (90 degrees).

Back

Perpendicular Lines

Front

A flat surface that extends infinitely in all directions.

Back

Plane