A straight line.
parallel lines
It would be a ray (one half of a line).In geometry "A set of points extending infinitely in one direction" is called a RAY.
Only two are necessary to define a line. But infinitely many are required to DRAW it.
That would be an infinitely long line. Or just called a line if you are talking about graphs
diagonal
A line is a straight path that extends infinitely or endlessly in opposite directions. A straight path that joins two points is called a line segment.
a line
A line
A straight line with no end points such as the number line
parallel lines
Line
A line
a line
That is a straight line.
A straight line of infinite length!
It would be a ray (one half of a line).In geometry "A set of points extending infinitely in one direction" is called a RAY.
A straight angle has 180 degrees. It is an angle that has sides in opposite directions from its vertex. A straight angle will look like a straight line.