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Geometry Grades 6-8 by Tiffany Moore and Jenae Hawkins pages 5-14

opposite rays

Two rays that share an endpoint and extend in opposite directions to form a line


Position in space, often represented by a dot


A portion of a line that extends from one endpoint infinitely in one direction

point of intersection

The point at which two lines intersect


Something that relates to or resembles a line


A point that bisects a line segment

parallel lines

Lines in the same plane that never intersect

collinear points

Three or more points that lie in the same line

perpendicular lines

Two lines that form a right angle at their point of intersection

line segment

A finite portion of a line that has two endpoints


A set of points in a straight path that extends infinitely in both directions


A flat surface that extends infinitely in all directions

coplanar points

Three or more points that lie in the same plane

flat-plane rule

If three points are coplanar, then the line containing two of the points is in the same plane

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