Foundations of Geometry 1.1-1.4 notes

Front

Point

Back

No size, represents a location. Named using a single capital letter

Front

Line

Back

Continous arrangement of infinite points. Named using two points or a cursive letter.

Front

Plane

Back

Flat surface with length and width, extends infinitely in two dimensions. Name using 3 non co-linear points, or one cursive letter.

Front

Line segment

Back

Piece of a line with two endpoints. Named using the endpoints.

Front

Ray

Back

part of a line with one endpoint, extends infinitely in one direction. Named using the endpoint first then any second point.

Front

Collinear points

Back

Points that lie on the same straight line

Front

Coplanar points

Back

Points, lines, or rays that lie on the same plane

Front

Congruent Segments

Back

Two or more segments that have the same length. Identified using the congruent symbol.

Front

Midpoint

Back

A point on a segment that is the same distance from each endpoint.

Front

Angle

Back

The space between two rays, lines or segments that share an endpoint. Named using 3 points.