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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mathstodon.xyz/users/johncarlosbaez/statuses/113420370432564927">John Carlos Baez (johncarlosbaez@mathstodon.xyz)'s status on Monday, 04-Nov-2024 10:08:02 JST</a><a href="https://mathstodon.xyz/@johncarlosbaez" title="johncarlosbaez@mathstodon.xyz"><img src="https://gnusocial.jp/avatar/83718-48-20230101212054.webp" width="48" height="48" alt="John Carlos Baez" style="position: absolute; left: 0; top: 0;">John Carlos Baez</a><div><a href="https://mathstodon.xyz/@johncarlosbaez/113420348720448294" rel="in-reply-to">in reply to</a><ul><li></ul></div></section><article><p>Here is what <a href="https://mathstodon.xyz/@GerardWestendorp">@GerardWestendorp</a> got when he folded up this 11-pointed star: a hexagonal antiprism!  The top is a regular hexagon, and so is the bottom, but the bottom is rotated 1/12th of a full turn compared to the top.  Around the sides there are 12 equilateral triangles.</p><p>If you don't know about antiprisms, you can look at some here:</p><p><a href="https://en.wikipedia.org/wiki/Antiprism" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Antiprism</a></p><p>(2/3)</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/3932146#notice-7682710">In conversation</a><time datetime="2024-11-04T10:08:02+09:00" title="Monday, 04-Nov-2024 10:08:02 JST">about 19 days ago</time> <span>from <span><a href="https://mathstodon.xyz/@johncarlosbaez/113420370432564927" rel="external" title="Sent from mathstodon.xyz via ActivityPub">mathstodon.xyz</a></span></span><a href="https://mathstodon.xyz/@johncarlosbaez/113420370432564927">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/3406354">An 11-pointed star whose vertices lie on a grid of equilateral triangles, and a copy that has been cut out and folded up. Made and photographed by Gerard Westendorp, and placed by him on Mathstodon, here:https://mathstodon.xyz/@GerardWestendorp/113419078439715042</a></label><br><a href="https://media.mathstodon.xyz/media_attachments/files/113/420/353/590/324/875/original/27156423d58c8baf.jpg" rel="external">https://media.mathstodon.xyz/media_attachments/files/113/420/353/590/324/875/original/27156423d58c8baf.jpg</a></li></ol></footer></blockquote>

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John Carlos Baez (johncarlosbaez@mathstodon.xyz)'s status on Monday, 04-Nov-2024 10:08:02 JSTJohn Carlos Baez
in reply to
- Gerard Westendorp
Here is what @GerardWestendorp got when he folded up this 11-pointed star: a hexagonal antiprism! The top is a regular hexagon, and so is the bottom, but the bottom is rotated 1/12th of a full turn compared to the top. Around the sides there are 12 equilateral triangles.
If you don't know about antiprisms, you can look at some here:
https://en.wikipedia.org/wiki/Antiprism
(2/3)
In conversationabout 19 days ago from mathstodon.xyzpermalink
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1. An 11-pointed star whose vertices lie on a grid of equilateral triangles, and a copy that has been cut out and folded up. Made and photographed by Gerard Westendorp, and placed by him on Mathstodon, here: https://mathstodon.xyz/@GerardWestendorp/113419078439715042
  https://media.mathstodon.xyz/media_attachments/files/113/420/353/590/324/875/original/27156423d58c8baf.jpg

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