Exercise 23 Page 592

We are asked to determine whether the given figure is a line segment, line, or ray and then name it using symbols. Let's start by recalling the definitions of a line, line segment, and ray.

Line Segment	A line segment is part of a line bounded by $two$ different points, called $endpoints .$
Line Segment	A line segment with endpoints $A$ and $B$ is denoted as $\overline{A B}$ or $\overline{B A} .$
Line	A line is a one-dimensional object of infinite length with no width or thickness that never bends or turns. Its graphical representation is a straight line with arrowheads on either end, indicating that it continues indefinitely in both directions. A line has $no$ $endpoints .$
Line	A line with points $A$ and $B$ on it could be named $A B$ or $B A .$
Ray	A ray is a portion of a line formed by $one$ $endpoint$ and all the points of the line on the same side of the endpoint.
Ray	A ray with starting point $A$ and passing through point $B$ is denoted as $A B .$