the answer is 9.1 because there are 10 mm in a centimeter
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No, Line Segments do not have a fixed length. A line segment can be as long as you want it to be but, it has to stop somewhere. It is not a line and so it does not continue on for-ever.
A line is of infinite length, a segment is of finite length.
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A line segment is a straight path between two points on a line. Its length is the distance between those two points.