# BJUGeometry 2.1-2. 3

The flashcards below were created by user alyzapinski13 on FreezingBlue Flashcards.

1. Half Line
the net of all points on a line on a given side of a given point of the line. (Does NOT include origin)
2. Line Seperation Postulate
every point divides a line through that point into 3 disjoint sets: the point and two half-lines.
3. Ray
• the union of the half line and its origin. Extends infinatly in one direction
• (1st letter is origin)
4. Between
B is between A and C if BC (ray) n BA (ray)={B}.

A-B-C are collinear
5. Opposite Rays
BA(ray) & BC(ray) are opposite rays if and only if B is between A and C
6. Segment
the set of two points A and B and all the points inbetween (ex. AB with line over)
7. Vector
a directed line segment (Arrow above letters has only half an arrowhead.)
8. Half-Plane
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}
9. Edge of half-plane
the line that seperates the plane into two half-planes (not part of either 1/2)
10. Opposite half-plane
the two half planes that are seperated by a particular line on the plane (each half is labeled s1 or s2)
11. Plane seperation postulate
every line divides any plane containing the line into 3 disjoint sets (the line, and 2 half-planes)
12. Angle
the union of two distinct rays with a common end point (vertex)
13. Interior of an angle
the intersection of two half planes each determined by a side of the angle and containing the other side (except the vertex)
14. Exterior of an angle
the complement of the union of the angle and its interior
 Author: alyzapinski13 ID: 35175 Card Set: BJUGeometry 2.1-2. 3 Updated: 2010-09-16 21:34:50 Tags: BJUGeometry Folders: Description: BJUGeometry 2.1-2.3!!!!!! Show Answers: