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It means the lines will never meet, even if they went on infinitely long. The lines move in exactly the same direction, even if their length is different. Another way to think about it, is that you could lay one line over the other, and you would only see one line (because they line up exactly).

To help visualize this, lay to pencils side by side so that the eraser is flush with something (a piece of paper, table end, etc.). These pencils are said to be parallel.

With a square, the "top" and "bottom" lines are parallel to each other. The "left" and "right" lines are parallel to each other. But, for example, the "top" and "left" lines are perpendicular to each other, which just means they form a 90 degree angle.

The symbol used to denote parallel is: ∥ (two parallel lines actually)

So A ∥ B just means A is parallel to B.

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11y ago

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Q: What do parallel lines mean?
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