2007-02-27 03:41:13 · 6 answers · asked by bfrey25 1 in Science & Mathematics ➔ Engineering
To minimize the possibility of marring the edge so that it no longer can draw straight lines.
2007-02-27 03:47:07 · answer #1 · answered by ironduke8159 7 · 0⤊ 0⤋
Plus it's great for when you use it as a straight edge to cut with!
2007-02-27 11:54:04 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Makes it easier to draw a straight line.
2007-02-27 11:46:12 · answer #3 · answered by Brian L 7 · 0⤊ 0⤋
It is there so that when you draw a straight line with a pen or a marker; the ink will not smear.
2007-02-27 13:20:17 · answer #4 · answered by J C 5 · 0⤊ 0⤋
In addition to the above, it prevents warping which would throw measurement off and distort lines
2007-02-27 11:49:31 · answer #5 · answered by Huey from Ohio 4 · 0⤊ 0⤋
Because it doesn't wear out as quickly as wood would.
Doug
2007-02-27 11:47:07 · answer #6 · answered by doug_donaghue 7 · 0⤊ 0⤋