Point
A location that has no size or shape. Named with a dot and a capital letter.
Line
A straight path that has thickness and extends infinitely in all direction. Two ways to name line: "line l" or "XY (line with two arrows)".
Plane
A flat surface that extends infinitely in all directions. Two ways to name planes: "Plane ABC" or "Plane R".
Segment
Part of a line consisting of two endpoints and all points in between. Name a segment by its endpoint with a bar over the top.
Ray
Part of a line that starts at an endpoint and extends forever in one direction. Name a ray with its endpoint and any other point on the ray with the arrow symbol on top.
Opposite Rays
Two rays sharing the same endpoint that make a straight line.
Collinear
Points that lie on the same line.
Non-collinear
points not on the same line
Coplanar
Points that lie on the same plane.
Non-coplaner
points that do not lie on the same plane
skew
Lines that do not intersect, are not parallel, and not on the same plane