a line with an arrow at one end going up is a right angle
Ray
a line. arrow on one end is called a ray and no arrows is called a line segment.
An arrow (→) has one line of symmetry. A double-headed arrow (↔) has two lines of symmetry and rotational symmetry if you want to claim it.
The line, itself, is a subset (though not a proper subset). A ray is a subset of a line with one end-point which extends in only one direction. A line segment is a subset of a line with two end points. A point is a subset of a line.
This question is very difficult to answer because of the ambiguity of what an "arrow" is. An arrow that you might fire from a bow is a three dimensional object and so is not a polygon. An arrow drawn as a straight line with a direction indicator at its head with or without tail feathers (for example <|----<< : oh, the graphics on this browser are so good, aren't they!) is not a polygon because the shaft is a line: a 1-dimensional object. An arrow such as the default one used to represent the cursor in Windows is a concave heptagon.
A line with an arrow on one end. Looks almost exactly like the symbol for a line segment, just with the arrow on one end.
Ray
A ray is a line with a point on one end and an arrow at the other.
add one arrow at the end.
a line. arrow on one end is called a ray and no arrows is called a line segment.
A ray. Rays have a starting point and no ending. They go on forever.
A ray is a line in which one side end with a dot, and the other, an arrow to symbolize that the line goes on forever on one side only.
An arrow (→) has one line of symmetry. A double-headed arrow (↔) has two lines of symmetry and rotational symmetry if you want to claim it.
Depending on the software used, usually Arrow up and Arrow down.For reference, also check possibilites with "Home", "End", "PgUp", "PgDn" and mouse scrolling.Usual the UP and Down arrow allows you to move one line a time. This may wary according to your program preferences or OS.
Cupid
A ray
A ray is similar to a line, however, it only continues in one direction, whereas a line continues in both. It's basically a line with only one arrow.