Geometry

Points

a single location in space that has no dimensions

Lines

A straight path that extends infinitely in both directions, has length but no width or depth

Planes

A flat surface that extends without end, has length and width but no thickness

Collinear

Points that lie on the same line

Coplanar

Points that lie on the same plane

Line segment

Part of a line with two endpoints

Ray

Part of a line with one endpoint, extends without end in one direction

Opposite rays

Two rays sharing the same endpoint and going in opposite directions

Skew lines

Lines in different planes that never intersect

intersections

Two lines intersect at a point

A line and a plane intersect at a plane

Two planes intersect at a line