BJUGeometry 2.1-2. 3

  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
Card Set
BJUGeometry 2.1-2. 3
BJUGeometry 2.1-2.3!!!!!!