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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/Bookshelves/Applied_Mathematics/Calculus_for_Business_and_Social_Sciences_Corequisite_Workbook_(Dominguez_Martinez_and_Saykali)/07%3A_Straight_Lines/7.02%3A_Parallel_LinesIn a coordinate plane, parallel Lines are lines that do not meet or intersect. They are always the same distance apart. Moreover, parallel lines have the same slope.
- https://math.libretexts.org/Courses/San_Joaquin_Delta_College/Technical_Mathematics_SJDC_1/07%3A_Trigonometry/7.01%3A_AnglesThis page offers a detailed explanation of angles, covering their definitions and types, such as acute, right, and obtuse angles. It discusses complementary and supplementary angles, triangle angle me...This page offers a detailed explanation of angles, covering their definitions and types, such as acute, right, and obtuse angles. It discusses complementary and supplementary angles, triangle angle measurement, and the relevance of angles in different fields. Additionally, the page describes the DMS method for angle representation and includes conversion techniques between decimal degrees and DMS. Practice exercises are also provided for reinforcement.
- https://math.libretexts.org/Courses/Northeast_Wisconsin_Technical_College/College_Technical_Math_1A_(NWTC)/08%3A_Trigonometry/8.01%3A_AnglesAngle measurement is important in construction, surveying, physical therapy, and many other fields. We can visualize an angle as the figure formed when two line segments share a common endpoint. We ca...Angle measurement is important in construction, surveying, physical therapy, and many other fields. We can visualize an angle as the figure formed when two line segments share a common endpoint. We can also think about an angle as a measure of rotation. A full rotation or a full circle is 360∘ , so a half rotation or U-turn is 180∘ , and a quarter turn is 90∘ .
- 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.
