Geometry Basics

Front

Point

Back

No dimension, a location on a plane, represented by a dot.

Front

Line

Back

One-dimensional, infinite set of points, extends without end.

Front

Plane

Back

A two-dimensional surface extending without end, often represented by a parallelogram.

Front

Line Segment

Back

Two endpoints and all points between them.

Front

Congruent Segments

Back

Segments that are of the same length.

Front

Midpoint of Segment

Back

Point that divides the segment into two congruent segments.

Front

Ray

Back

One endpoint, extending infinitely in one direction.

Front

Opposite Rays

Back

Rays on the same line that intersect at one point and go in opposite directions.

Front

Collinear Points

Back

Three or more points that lie on the same line.

Front

Coplanar Points

Back

Three or more points that lie on the same plane.