Question

draw and define line segment
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Answer 1

A line segment is a line with 2 end points and cannot be extended like a normal line.

Answer 2

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A closed interval corresponding to a finite portion of an infinite line. Line segments are generally labeled with two letters corresponding to their endpoints, say A and B, and then written AB. The length of the line segment is indicated with an overbar, so the length of the line segment AB would be written

$\longrightarrow \overline {ab}$

.

Curiously, the number of points in a line segment is equal to that in an entire one-dimensional space (a line), and also to the number of points in an n-dimensional space, as first recognized by Georg Cantor.