kottke.org posts about geometry

Always buy the bigger pizzaFeb 26 2014

Planet Money: always buy the bigger pizza because geometry.

The math of why bigger pizzas are such a good deal is simple. A pizza is a circle, and the area of a circle increases with the square of the radius.

So, for example, a 16-inch pizza is actually four times as big as an 8-inch pizza.

And when you look at thousands of pizza prices from around the U.S., you see that you almost always get a much, much better deal when you buy a bigger pizza.

The Sierpinski triangleOct 09 2013

Sierpinski Curved

More than you've ever wanted to know about the Sierpinski triangle.

Throughout my years playing around with fractals, the Sierpinski triangle has been a consistent staple. The triangle is named after Wacław Sierpiński and as fractals are wont the pattern appears in many places, so there are many different ways of constructing the triangle on a computer.

All of the methods are fundamentally iterative. The most obvious method is probably the triangle-in-triangle approach. We start with one triangle, and at every step we replace each triangle with 3 subtriangles:

The discussion even veers into cows at some point...but zero mentions of the Menger sponge though? (via hacker news)

Have you seen this fractal?Nov 03 2009

Circle gasketUnknown fractal. It's sort of like a Sierpinski gasket but with circles. (via migurski)

Update: Turns out that this fractal is "the orbit of a circle under a Kleinian group generated by two Mobius transformations". (thx, david)

Using a geometric shape called a ReuleauxDec 01 2006

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)

Tags related to geometry:
mathematics fractals

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