MATH - INTRO TO GEOMETRY

• Line


  Has two arrows and extends in opposite directions forever
• Ray


  Has a point and extends forever in one direction
• Segment


  Has a beginning and an end
• Types of angles


  • Acute angle (0-90 degrees)
  • Right angle (90 degrees)
  • Obtuse angle (>90-180 degrees)
  • Straight angle (180 degrees)
• Collinear points


  Points that lie on the same line
• Non-collinear points


  Points that do not lie on the same line
• Coplanar points


  Points that lie in the same plane
• Non-coplanar points


  Points that do not lie in the same plane
• Line


  A straight continuous arrangement of infinitely many points, with infinite length extending infinitely in two directions and no thickness
• Line segment


  A part of a line consisting of two end points and all the points in between
• Endpoints


  The two points that define a line segment
• Line


  A straight continuous arrangement of infinitely many points, with infinite length extending infinitely in two directions and no thickness
• Congruent segments


  Two line segments that have the same measure or length
• Naming a line


  Using a single lowercase script letter or two capital letters representing points on the line
• Line segment


  A part of a line consisting of two end points and all the points in between
• Congruent segments


  Line segments with the same measure or length
• Ray


  A part of a line with only one endpoint, extending infinitely in one direction
• Opposite rays


  Rays with a common endpoint, extending in opposite directions
• Opposite rays are always between the other two points on the line