Its so its easy to caculate
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A line with an arrow at both ends is simply a line.
No. However, it does have to have a beginning number. beside the beginning number, on the actual line, you would put an arrow on the end of it, because numbers are infinite in both directions.
A ray has one arrow on the right. A line segment has a dot on both sides. A line has a arrow on both sides.
No. the arrow end comprises more than one straight line segments.
The word head makes a compound word with both arrow and line. Examples: arrowhead, headline