BJUGeometry 2.1-2. 3

the net of all points on a line on a given side of a given point of the line. (Does NOT include origin)

every point divides a line through that point into 3 disjoint sets: the point and two half-lines.

• the union of the half line and its origin. Extends infinatly in one direction
• (1st letter is origin)

B is between A and C if BC (ray) n BA (ray)={B}.

A-B-C are collinear

BA(ray) & BC(ray) are opposite rays if and only if B is between A and C

the set of two points A and B and all the points inbetween (ex. AB with line over)

a directed line segment (Arrow above letters has only half an arrowhead.)

the subset of a plane consiting of all the points on a given side of a line in the plane {if points P and Q are in a 1/2 plane, then si is the segment joining them}

the line that seperates the plane into two half-planes (not part of either 1/2)

the two half planes that are seperated by a particular line on the plane (each half is labeled s1 or s2)

every line divides any plane containing the line into 3 disjoint sets (the line, and 2 half-planes)

the union of two distinct rays with a common end point (vertex)

the intersection of two half planes each determined by a side of the angle and containing the other side (except the vertex)

the complement of the union of the angle and its interior