no size, no demension, represented by a dot, indicates position point straight, continues endlessly, made up of an infinite number of points line points that are on the same line colliner points points that are not on the same line noncolliner points extends in 2-D endlessly in all directions, made up of points plane points that line on the same plane coplanar points points that don't lie on the same plane noncoplanar points a part of a line that consists of two points called end points line segment part of a line that consists of a point called an initial point, and all points on the line that extends in one direction ray two rays with the same end point that extends in opposite direction, MUST BE COLLINEAR opposite rays math
Of Mice and Men 