Parallel lines are lines that no matter how long they get will never run into each other.
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These are parallel lines. You can see that if you made either one of them shorter or longer, they would never meet.
/ and _ are not parallel lines because they would run into each other.
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The angle of incidence would be 90 degrees, so the angle of refraction is 0 degrees, as the light ray does not deviate.
A line of best-fit.
A straight line, a telephone line, a shipping line, a fishing line.
A line intersect is a point on a line where another line or object crosses the line.
In geometry a line is thought of as extending infinitely in both directions. A line segment is part of a line.