kottke.org

...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.

4 kottke.org posts about math

 

Calculate the cost of your sandwich

From Rob Cockerham's sandwich calculations:

Dijon mustard is to yellow mustard as a Rolls Royce is to your Honda. A 454 gram bottle sells for $6.99, and that is 5 cents per serving.

He adds up exactly how much homemade sandwiches cost based on the amount of ingredients and their correlating prices. The results are revealing: 98 cents for a processed turkey sandwich, 48 1/2 cents for a grilled cheese, and 64 cents for a pb&j. If you'd like to figure out how much bread you'll need for your picnic, try out Cockerham's sandwich calculator. For more dizzying and delicious equations, cut the corners off the drool-inducing Scanwiches.

By Ainsley Drew  •  Oct 7, 2009  •  food   math

Using a geometric shape called a Reuleaux

Using a geometric shape called a Reuleaux triangle, it's possible to drill square holes. Click through for all the exciting math!

Update: A video of a Reuleaux triangle rotating in a square. (thx, will)

Update: More on the Reuleaux triangle at MathWorld. (thx, nevan)

Update: The Reuleaux triangle is also the basis for the Wankel engine.. (thx, brian & adam)

By Jason Kottke  •  Dec 1, 2006  •  geometry   math   video

Mathematical analysis confirms the conventional wisdom of

Mathematical analysis confirms the conventional wisdom of auction bidders: the best way to win an eBay auction is to bid at the last possible moment.

By Jason Kottke  •  Jun 23, 2006  •  eBay   math   science

A pi pie

A pi pie. Note the edging on the crust.

By Jason Kottke  •  Apr 7, 2005  •  food   funny   math   pi   pie

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