Geometry Basics

Front

Definition of a point

Back

A point has no dimension (no length, width, or height) but has a location or position.

Front

How to name a point

Back

Name a point by a single capital letter.

Front

Definition of a line

Back

A line extends in opposite directions without end and has one dimension—length.

Front

How to name a line

Back

Name a line by a single lowercase letter or by any two points on the line.

Front

Definition of a plane

Back

A plane extends in two dimensions without end. The two dimensions are length and width, but no thickness.

Front

How to name a plane

Back

Name a plane by a single capital letter or by any three points on the plane (that do not lie on the same line).

Front

Dimensions of a plane

Back

A plane has two dimensions—length and width.

Front

Naming a point example

Back

Use a single capital letter, like "A".

Front

Naming a line example

Back

Use a single lowercase letter, like "l", or two points, like "AB".

Front

Naming a plane example

Back

Use a single capital letter, like "P", or three points, like "ABC".