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Parallel is a term in geometry and in everyday life that refers to a property of lines or planes. Parallel lines or planes are next to each other, but never touch each other. This means they never intersect at any point. If two lines [math]\ell_1[/math] and [math]\ell_2[/math] are parallel, then we describe this by writing [math]\ell_1 \parallel \ell_2[/math]. The slopes of parallel lines are always equal.
Even if these two line segments were extended to infinity, there would never be a point of intersection between the two of them. In fact, two parallel lines in the two-dimensional plane are always a fixed distance apart.
- "List of Geometry and Trigonometry Symbols" (in en-US). 2020-04-17. https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/.
- Weisstein, Eric W.. "Parallel" (in en). https://mathworld.wolfram.com/Parallel.html.
- "Perpendicular and Parallel". https://www.mathsisfun.com/perpendicular-parallel.html.