Geo Essentials 1.1 Vocabulary

Line

• ~Has a finite number of points

• ~Extends forever in TWO directions

• ~Is always curved

• ~Can be measured in length

Point

• The largest figure in Geometry.

• A figure with both location and size.

• The smallest figure in Geometry.

• A figure that can be measured.

Opposite Rays

• Two rays that share the same endpoint

• Two rays that diverge from a common point

• Two rays that form an angle

• Two rays that are parallel to each other

Segment

• ~part of a line

• ~extends infinitely in both directions

• ~has no endpoints

• ~is a type of angle

Ray

• ~part of a line

• ~has TWO ENDPOINTS

• ~Extends forever in both directions

• ~is a closed figure

Collinear Points

• points that lie on the SAME LINE

• points that are equidistant from each other

• points that form a triangle

• points that lie on different planes

Plane

• Extends forever in all directions

• Has a definite length and width

• Contains only a finite number of points

• Is a three-dimensional object

Coplanar Points

• points that lie on the SAME PLANE

• points that lie on different planes

• points that are collinear

• points that form a triangle