Basic Geometric Concepts

Front

Dot

Back

Point

Front

Line

Back

A figure with no thickness that extends forever in opposite directions

Front

Line with arrows on both ends

Back

Line

Front

Plane

Back

A flat surface that extends forever in all directions

Front

Line Segment

Back

A piece of a line with two endpoints

Front

Parallel Lines

Back

Lines in the same plane that never intersect

Front

Back

Ray

Front

Perpendicular Lines

Back

Intersecting lines forming 4 right angles

Front

Angle

Back

Two rays that come to a common endpoint

Front

Vertex (Vertices)

Back

The point(s) where two segments or rays of a figure meet