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

Modern Puzzles by Henry Ernest Dudeney: $120$

The Ribbon Pentagon

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?

Solution

This is demonstrated in Trefoil Knot in Paper forms Pentagon:

Also see

• Henry Ernest Dudeney: Puzzles and Curious Problems $222$ - Folding a Pentagon

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Solutions: $120$. -- The Ribbon Pentagon