Geometry Basics

Front

Points

Back

An exact location in space, represented by a dot.

Front

Lines

Back

A straight one-dimensional figure having no thickness and extending infinitely in both directions.

Front

Planes

Back

A flat, two-dimensional surface that extends infinitely far.

Front

Segment Addition Postulate

Back

If B is between A and C, then AB + BC = AC.

Front

Line Segment

Back

A part of a line that is bounded by two distinct end points.

Front

Ray

Back

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

Front

Collinear

Back

Points that lie on the same line.

Front

Coplanar

Back

Points that lie on the same plane.

Front

Congruent Segments

Back

Line segments that have the same length.

Front

Segment Bisector

Back

A line, segment, ray, or plane that intersects a segment at its midpoint.