title: Apr 06 2021 - 08:34:14 PM
date: 2021-04-06 20:34:14
slug: 06-203414
status: published
display_format: short-note
link: https://jj.isgeek.net/2021/04/06-203414/
reply_to: {"url": "https://twitter.com/AlgebraFact/status/1379531950239719441", "is_image": false, "twitter": true, "summary": "A 60 degree angle cannot be trisected by ruler and compass constructions.", "author": {"name": "Algebra Etc.", "username": "AlgebraFact", "url": "https://t.co/vtMHCfHOxg", "image": "https://bm.isgeek.net/82/5e/54d8235b020028a33f438ad7bcd7e0f80b6703aa5b50fbc906d5403d5919.jpg"}, "site_name": "Twitter"}
titleless: True
syndication: https://twitter.com/jjdelc/status/1379532927944495105
mentions: [{"source": "https://brid.gy/comment/twitter/jjdelc/1379532927944495105/1379551938547752962", "title": "yeah, the key word being \"arbitrary\". you can trisect certain angles, if you know their degree, a 90\u00b0 angle for example... since 60 degree is also a \"nice\" number, it might have been possible, but seems like that is not the case.", "url": "https://twitter.com/Sur_Taka/status/1379551938547752962", "published": "2021-04-06T21:49:47+00:00", "author": {"name": "\ud83c\udff4", "photo": "https://bm.isgeek.net/18/5e/96573c778147c25a2b7f57c714cd587da15b5ebb8bfbe969eb7ef030a023.jpg", "url": "https://twitter.com/Sur_Taka"}, "via": "brid.gy"}, {"source": "https://brid.gy/like/twitter/jjdelc/1379532927944495105/757825701827317760", "title": "", "url": "https://twitter.com/jjdelc/status/1379532927944495105#favorited-by-757825701827317760", "author": {"name": "msk", "photo": "https://bm.isgeek.net/4b/8c/3c90a4e5f8ba7529044c95c8bccaba9b4bdb786f951345d3f2d3dd177aa8.jpg", "url": "https://twitter.com/maths247366"}, "is_like": true, "via": "brid.gy"}, {"source": "https://brid.gy/like/twitter/jjdelc/1379532927944495105/1243400998250401792", "title": "", "url": "https://twitter.com/jjdelc/status/1379532927944495105#favorited-by-1243400998250401792", "author": {"name": "Anurag", "photo": "https://bm.isgeek.net/73/4c/930006def943bfa98cf6eabd9cb24e8f882e00ef69e3190b1c5c75d3947e.jpg", "url": "https://twitter.com/Unuragtime"}, "is_like": true, "via": "brid.gy"}, {"source": "https://brid.gy/like/twitter/jjdelc/1379532927944495105/407294143", "title": "", "url": "https://twitter.com/jjdelc/status/1379532927944495105#favorited-by-407294143", "author": {"name": "Troy Nemeth", "photo": "https://bm.isgeek.net/6d/3b/5a7a76d1bfcb247ffd77431051c491e6b4a891a9f4c060eb88c63e4d382a.jpg", "url": "https://twitter.com/snakeyes244"}, "is_like": true, "via": "brid.gy"}]


As I recall, it is not something particular about 60deg angles. But the impossibility of arbitrary angle trisection.