#3176: Inverted Catenaries

XKCD comic, described below.
Transcript
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[Megan and Cueball are walking together as inverted catenary curves fall from the sky. A few have landed in a regular formation, all flat-side down and evenly spaced, with some touching each other.]

Cueball: Oh wow, the first inverted catenary fall of the year!

Cueball: Time to swap out my all-season tires for square ones.


(Sourced from explainxkcd.com)

Title text:Some tires are marketed as 'all-shape tires,' but if driven in a climate with both inverted catenary falls and triangle falls, they wear out really fast.


ExplainOriginal