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A line is *defined* as something that is completely straight...An imaginary path from one point to another of the shortest distance possible constitutes a "line"...And if you really want to get picky, thats actually only a line segment..A line would continue in that fashion infinitely =) Its just defined that way. If it has jagged parts, or imperfections, it is not differentiable at every point, and is not a line...OR a curve! =) Thanks about sig =)

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