point- an exact loction in space with indefinite shape and size. line- an object with no thickness that extends infinitely in 2 directions. line segment- a portion of a line consisting of 2 end points and all point in between. ray- a portion of a line consisting of 1 end point and all point in between. opposite ray- 2 ray sharing the same end point and continuing infinitely in 2 direction. plane- a flat surface that extends infinitely in all direction. collinear- point that lie on the same line. non collinear- point that do not lie on the same plane.
