## Archive for November 3rd, 2008

### Folding a golden rectangle

Posted by: **Dave Richeson** on November 3, 2008

A blog about math, puzzles, teaching, and academic technology

Posted by: **Dave Richeson** on November 3, 2008

Euler's Gem: The polyhedron formula and the birth of topology

Princeton University Press

2008

Euler's Gem Facebook page

Buy it:

Princeton University Press

Amazon

Princeton University Press

2008

Euler's Gem Facebook page

Buy it:

Princeton University Press

Amazon

- Here's a picture of the puzzle with a cloth bag and a wooden square. smallpuzzlecollection.blogspot.com/2013/09/correc… https://t.co/7CJOH15bjs 21 minutes ago
- RT @lizardbill: @MightyPork @divbyzero One version I saw used a solid chess board and a cloth bag. 27 minutes ago
- By the way: this puzzle was invented by Hirokazu Iwasawa. He presented it at G4G 2014. It is possible without bendi… twitter.com/i/web/status/7… 39 minutes ago
- My favorite puzzle: Put this paper in this bag so it lays flat. Paper: 13x13cm, bag: 9.2x18.4cm. Scale yours accord… twitter.com/i/web/status/7… 42 minutes ago
- A polyhedral torus made from 24 congruent isosceles triangles: V=12, F=24, E=36. (Source: plus.google.com/+IsaacCalder/p…) https://t.co/2CjIyfi2Kg 5 hours ago

- Lincoln and squaring the circle
- How to curve an exam and assign grades
- What is the difference between a theorem, a lemma, and a corollary?
- Is or an inclusive or or an exclusive or?
- Music is math: ten songs about mathematics
- LaTeX now available in Google Docs
- Showing two expressions are equal: stop the madness
- Measuring an angle with a ruler
- Trigonometric functions and rational multiples of pi
- Volumes of n-dimensional balls