Salgood Sam aka Max DouglasOct 5, 2024

Posted without further comment 🔻

#meme #absurdist #geometry #blog

Show threadmyrmepropagandistOct 5, 2024

@salgood

I'm saving this for the quadrilaterals unit. Although, I do think we define "sides" to be "straight lines" which has its own problems as an undefined term. Still I like this.

Show threadAlisonW ♿🏳️‍🌈♾️Oct 5, 2024
@futurebird @salgood
Four *internal* right angles would be sufficient.
Show threadmyrmepropagandistOct 5, 2024

@AlisonW @salgood

How do you know which side is the internal one?

Show threadAlisonW ♿🏳️‍🌈♾️
@futurebird @salgood
I'd presume the enclosed space but ymmv.
Oct 5, 2024 at 3:00pmWeb
Show threadmyrmepropagandistOct 5, 2024

@AlisonW @salgood

But how do you define which side is the "inside" and which one is the "outside" ? How do we make that concept well defined?

Show threadPiotr BialeckiOct 5, 2024
@futurebird @AlisonW @salgood so for fun, pick some reasonable definition and see if it checks out ;⁠)
Show threadChrister EricsonOct 6, 2024

@futurebird @AlisonW @salgood
The Jordan Curve Theorem?

But also see e.g. this (older article) for several practical implementations for point-in-polygon testing:

https://erich.realtimerendering.com/ptinpoly/

Point in Polygon Strategies

Point in Polygon Strategies article from Graphics Gems IV