Undefined Terms

• Point

  • A position in space
  • No dimensions
  • Can be named as point A
  • Can be represented as

  
• Line

  • Set of continuous points that extend indefinitely in both directions
  • No width and thickness; straight and has infinite length
  • The representation can be named as line t or
  • and can be represented by a number line

  
• Plane

  • A set of points contained in a flat surface and extends indefinitely in all directions
  • Has infinite length and width but no thickness
  • The representation can be named as: plane C, plane A, plane R, plane CAR, plane ARC, plane RCA, etc.
  • Can be represented as:

  
• Segment - A portion of a line that has TWO endpoints
• Ray - A portion of a line having ONE endpoint
• Opposite Rays - TWO rays which are opposite in direction or has ONE common endpoint