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Pizza Rule
(telegra.ph)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
What's the app?
I think its the calculator app, with a bit of prompt engineering to get the needed results.
https://f-droid.org/packages/de.drhoffmannsoft.pizza/
Android Studio + a bit of math?
Lol aww c'mon, I'm too hungry for pizza, don't make me do geometry! ๐
Wolfram Alpha.