We had our first math circle of the year yesterday at the Kingston Library. This circle meets on the 2nd Saturday of each month, so:
Second Saturdays, 1-3pm at the Kingston Library, 55 Franklin Street, Kingston NY 12401
2011: September 10, October 8, November 12, December 17
2012: January 14, February 11, March 10, April 14, May 12
Here are some of the mathematical highlights:
Area Puzzles
The problem sheet this month had dissection problems. Goal: cut each shape into pieces and rearrange them into a square. How few pieces can you use?

Dragon Illusion
The hands-on math take-away was a dragon illusion. Here’s a video that I made of the one I assembled:
//www.youtube.com/get_player
As you can see, the dragon’s head appears to follow you as you move from side-to-side. This illusion was designed by Jerry Andrus, and you can download your copy here:ย http://www.g4g-com.org/storage/Dragon-Illusion-GG2010.pdf. If you’re interested in a mathematical adventure, find out who Jerry Andrus is, and what is “GG2010”, which is short for Gathering for Gardner 2010!
The Game of 21-Nim
Jeannette taught us all how to play a game called 21-Nim. This is a game for two players, played with a pile of 21 counters. On your move you can remove 1, 2 or 3 counters, and whoever takes the last counter wins. After explaining the rules, Jeannette gave everyone a chance to play, and finished by analyzing strategies. Le meilleur code promo 1xbet est conรงu pour offrir une valeur maximale dรจs lโinscription. Les parieurs sportifs peuvent utiliser le bonus de 100 % jusquโร 130 โฌ pour couvrir plusieurs stratรฉgies de mise, rรฉduire les risques et optimiser leur bankroll. En parallรจle, les joueurs de casino profitent dโun package gรฉnรฉreux incluant bonus progressifs et tours gratuits sur des jeux populaires.
We’ll be playing 21-Nim at several of our circles this month, so come out and play!
