periodic line
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Line.
a line a ray goes in only one direction forever No, a line goes on forever in two directions, a ray starts at one point and then goes on forever.
If the threes go on indefinitely, then it is a repeating decimal, represented by a line over the repeated number, also .333...(going on forever) is equivalent to 1/3
A line segment is a specific length. A line goes on forever in both directions.
If it is a repeating decimal for a rational number, such as 1/3 (.333...), you can write the sequence once and draw a "repeating" notation above the sequence. So in the case of 1/3, I would write ".3" with a horizontal line above the "3". In the case of an irrational number such as Pi or a decimal for which you do not know the sequence repeated, you can just round it off to the precision required. For Pi, this is often expressed as "3.14," for example.