Front

Point

Back

A location that has no shape or size.

Front

Line

Back

Made up of points and has no thickness or width.

Front

Plane

Back

A flat surface made up of points and extends indefinitely in all directions.

Front

Segment

Back

The part of a line that consists of two endpoints and all points between them.

Front

Ray

Back

Part of a line that consists of one endpoint and extends indefinitely in the other direction.

Front

Angle

Back

Formed by two rays with the same endpoint. Each ray is the side of the angle, and the common endpoint is the vertex of the angle.

Front

Collinear

Back

on the same line .

Front

Coplanar

Back

Points on the same plane

Front

Segment Addition Postulate

Back

If points A, B, and C are on the same line with B between A and C, then AB + BC =AC.

Front

Angle Addition Postulate

Back

If point D is in the interior of <ABC, then

m∠ABD + m∠DBC = m∠ABC.