Henry Ernest Dudeney/Modern Puzzles/125 - Making a Pentagon

Modern Puzzles by Henry Ernest Dudeney: $125$

Making a Pentagon

How do you construct a regular pentagon on a given unit straight line?

Dudeney's original article was unnecessarily prolix.

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Geometrical Problems: Various Geometrical Puzzles: $125$. -- Making a Pentagon
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Geometrical Problems: Triangle, Square & Other Polygon Puzzles: $257$. Making a Pentagon