Henry Ernest Dudeney/Modern Puzzles/120 - The Ribbon Pentagon

by : $120$

 * The Ribbon Pentagon
 * The solution to the following will be found very interesting if the reader has not seen it before.


 * I want to form a regular pentagon, but the only thing at hand happens to be a rectangular strip of paper.
 * How am I to do it without pencil, compasses, scissors, or anything else whatever but my fingers?