A tiny triangle theorem

25 October , 2009

A very small post about a tiny theorem. I found this in the excellent book Proofs without Words.

http://www.geogebra.org/en/upload/files/Norwegian/oisteing/blog/A_tiny_theorem_of_a_hypotenuse.html

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The imaginary number of the beast

13 October , 2009


The centers of a triangle

12 October , 2009

There are many points competing for the title. What is the center of a triangle? In this dynamic page I gather the five most common contenders. I also throw in some circles and other points as well, trying to cram as much info as possible into this very page.

Oh – and it’s Norwegian, I thought Obama might like it 🙂

(If anyone nags me about it, I’ll make a translation!)

Look here: http://www.geogebra.org/en/upload/files/Norwegian/oisteing/trekantsenter.html