Trim marks of equilateral triangular shape

DETAILED DESCRIPTION These and other objectives are achieved by printing on the answer sheet or other document trim marks comprising sets of equilateral triangles arranged so that one corner of each triangle lies along the trim line.
Since the loci of these corner points define the trim line, there is no need to print a separate line defining the trim line itself.
The side of each triangle adjacent the one corner is perpendicular to the trim line, and the side opposite this corner is parallel to the trim line.
Since the triangle is equilateral, if the page is severed away from the trim line, the width of the truncated portion of the triangle will be equal to the amount of offset error in the cut.
Preferably the triangles are arranged in widely spaced sets along the trim line.
Each such set includes a first pair of triangles on one side of the trim line and a second pair on the opposite side, with the trim line defining corners of the second pair between the like corners of the first pair.
In this way, if a stack of the cut sheets are viewed edge on, the spacing between the marks will indicate whether the cut is perfect, is displaced in one or the opposite direction from the train line, or is skewed.