Introduction to Geometry Vocab

Front

Undefined Terms

Back

Terms that do not have formal definitions (e.g. point, line, and plane)

Front

Defined Terms

Back

Terms that can be described using known words such as point or line.

Front

Congruent

Back

Having the same measurement

Front

Collinear points

Back

Points that lie on the same line

Front

Coplanar points

Back

Points that lie in the same plane

Front

Line Segment

Back

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 all points on the line that extend in one direction

Front

Opposite Rays

Back

If point C lies on line AB between A and B, then ray CA and ray CB are opposite rays.

Front

Intersection

Back

The set of points the figures have in common.

Front

Postulate or Axiom

Back

A rule that is accepted without proof.