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In geometry, in a two-dimensional plane, two lines are said to be parallel if they do not intersect, in spite of how much they are extended. For example, opposite sides of a square are parallel.

Parallel.jpg

Angle Properties

In the image to the right,

  • All of the red acute angles are congruent
  • All of the blue obtuse angles are congruent
  • 3 and 6 are alternate interior angles
  • 4 and 5 are alternate exterior angles.
  • 3 and 7 are corresponding angles.
  • 4 and 8 are corresponding angles
  • 1 and 5 are corresponding angles
  • 2 and 6 are corresponding angles
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