This is a companion discussion topic for the original entry at https://www.kirupa.com/math/equilateral_triangles.htm
I wrote something in AS a loooooong time ago that could draw regular polygons of any side number and size: Polygons
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A few more articles and you can create a new book on triangles. 
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@TheCanadian - This is really nice! My next-ish article is on creating polygons of arbitrary sides using an approach similar to yours 
@prg9 - you never know haha! Though, this may get rolled into my next update to the old Canvas book.
It can compete for shelf space with this thriller:
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I think every person should self-publish a book made up of nothing but random numbers 
Wow, 1955 that was a stroke of genious that predated the pet rock by 20 years.