Folding at right angles.
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1. a prescribed mathematical method for performing a calculation or solving a problem.2.to mark with lines, especially parallel straight lines, with the aid of a ruler or the like: to rule paper.3.to mark out or form (a line) by this method: to rule lines onpaper.
Lines that never intersect are either parallel or skew to each other. If they're both in the same plane (or on the same piece of paper), then they're parallel.
You construct a line perpendicular to the original and then a line perpendicular to this second line.
:) first measure it vertically then horizontally
Of course not ! Draw the letter ' X ' on a piece of paper. Then look atthe two edges of the floor in your room that meet at the same corner.