读到一篇国立台湾师范大学数学系郭君逸副教授写的有趣文章:
https://sites.google.com/a/g2.nctu.edu.tw/unimath/2020-08/straw
塑料吸管的斜口不是圆锥截面,侧看过去其实是正弦曲线,因为吸管用剪刀或裁刀裁切的时候,会先被压扁再被剪切。具体为什么侧面看过去是正弦曲线文章里有详细说明。
真是世事洞明皆学问,处处留心有数学啊。 https://twitter.com/txyyss/status/1300583920652574720
https://t.me/private_channel_c14370a/4245
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