Question

how can we make a square of 3 lines

Answer 1

1) By turning the paper while drawing a line; or perhaps folding it (I think this is cheating)

2) Drawing a "u" shape with one line. Then close off the ends of the square with two other lines

3) MathForum.org had this answer: (formats poorly on Yahoo, click the link)

http://mathforum.org/library/drmath/view/67255.html

A

/ | DA, AB, and BC are the three lines.

/ | and "4", of course, is the square: 4 = 2*2.

/ |

B---+-C The same idea works for "1" as well.

|

D