238328 10.03.2013 13:33 2264183456136291933192900

When I came home and told my father, he drew a triangle on the skin of an orange. All angles were 90°. I was deeply disturbed.

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1. 238328 10.03.2013 13:33 2264183456136291933192900

http://math.stackexchange.com/questions/...

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