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

Modern Puzzles by Henry Ernest Dudeney: $120$

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?

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Geometrical Problems: Paper-Folding Puzzles: $120$. -- The Ribbon Pentagon