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  • 2.4: Parallel Lines
    https://math.libretexts.org/Courses/Rio_Hondo/NBAS022_-_Review_of_Geometry_Part_A/02%3A_Lines_Angles_and_Triangles/2.04%3A_Parallel_Lines
    Two lines are parallel if they do not meet, no matter how far they are extended.
  • 1.2: A Brief History of Geometry
    https://math.libretexts.org/Bookshelves/Geometry/Geometry_with_an_Introduction_to_Cosmic_Topology_(Hitchman)/01%3A_An_Invitation_to_Geometry/1.02%3A_A_Brief_History_of_Geometry
    Geometry is one of the oldest branches of mathematics, and most important among texts is Euclid's Elements. His text begins with 23 definitions, 5 postulates, and 5 common notions. From there Eu...Geometry is one of the oldest branches of mathematics, and most important among texts is Euclid's Elements. His text begins with 23 definitions, 5 postulates, and 5 common notions. From there Euclid starts proving results about geometry using a rigorous logical method, and many of us have been asked to do the same in high school.
  • 1.4: Parallel Lines
    https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/01%3A_Lines_Angles_and_Triangles/1.04%3A_Parallel_Lines
    Two lines are parallel if they do not meet, no matter how far they are extended.

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