501 Geometry Questions

Line

A lineis a set of continuous points infinitely extending in opposite directions.
It has infinite length, but no depth or width. A line is most commonly defined
by its endpoints, but any two points on a line can be used to name it.

Plane

A planeis a flat expanse of points expanding in every direction. Planes have
two dimensions: length and width. They do not have depth.
As you probably noticed, each “definition” above builds upon the “def-
inition” before it. There is the point; then there is a series of points; then
there is an expanse of points. In geometry, space is pixilated much like the
image you see on a TV screen. Be aware that definitions from this point on
will build upon each other much like these first three definitions.

Collinear/Noncollinear

collinear points noncollinear points

A B C D A B

C

D

Figure

There is

no symbol to

describe

plane DEF.

D

Plane DEF, or

Plane X

E

FF

X

Figure Symbol

BC

Line BC, or

Line CB

BC

CB

501 Geometry Questions