Is there actually a difference between a line and a straight line ?
Is figure 1 a line . ?
.
Should I take help from " Euclid "? I believe according to " Euclid " the above figure is a valid line.
2026-03-28 23:10:37.1774739437
What is the difference between a " line " and a " straight line "?
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According to Euclid, "A line is breadthless length" (Elements I, Definition 2, T. Heath translation). So your figure appears to be a line. Euclid says a straight line is "a line which lies evenly with the points on itself" (Def. 4). The exact meaning of this definition has been disputed, but it seems clear at least that, for Euclid, a line and a straight line are not the same thing.