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In Geometry, lines go on to infinity in both directions. This is why arrows are used. The two letters, E and F define that line. Of course if you were to measure the distance from E to F, that would be a line segment or part of the line.
centimetres
a tape measure
Micrometer and Vernier
It is designed to easily cut curves. Whether it cuts in straight or curved lines depends how good the user is: a good user will be able to use it to cut straight lines, but a not-so good user will tend to "wobble" and so cut lots of little curves when trying to cut in a straight line.