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- https://math.libretexts.org/Courses/Rio_Hondo/NBAS022_-_Review_of_Geometry_Part_A/02%3A_Lines_Angles_and_Triangles/2.04%3A_Parallel_LinesTwo lines are parallel if they do not meet, no matter how far they are extended.
- https://math.libretexts.org/Courses/Cosumnes_River_College/Math_384%3A_Foundations_for_Calculus/06%3A_Triangles_and_Circles/6.01%3A_Angles_and_Basic_GeometryBefore jumping into Trigonometry, we need to build a solid foundation. This section provides the fundamental building blocks for working with the most basic quantity in Trigonometry - the angle. We de...Before jumping into Trigonometry, we need to build a solid foundation. This section provides the fundamental building blocks for working with the most basic quantity in Trigonometry - the angle. We delve into as much detail about angles as we dare, without introducing unnecessary topics. We cover a little bit of required Geometry for success in Trigonometry, and wrap things up with a brief geometric review of circles (another foundational topic for Trigonometry).
- https://math.libretexts.org/Courses/Cosumnes_River_College/Math_373%3A_Trigonometry_for_Calculus/01%3A_Triangles_and_Circles/1.01%3A_Angles_and_Basic_GeometryBefore jumping into Trigonometry, we need to build a solid foundation. This section provides the fundamental building blocks for working with the most basic quantity in Trigonometry - the angle. We de...Before jumping into Trigonometry, we need to build a solid foundation. This section provides the fundamental building blocks for working with the most basic quantity in Trigonometry - the angle. We delve into as much detail about angles as we dare, without introducing unnecessary topics. We cover a little bit of required Geometry for success in Trigonometry, and wrap things up with a brief geometric review of circles (another foundational topic for Trigonometry).
- https://math.libretexts.org/Bookshelves/Geometry/Elementary_College_Geometry_(Africk)/01%3A_Lines_Angles_and_Triangles/1.04%3A_Parallel_LinesTwo lines are parallel if they do not meet, no matter how far they are extended.