system
A chat on subreddit /r/me_irl
human
I was going to call bullshit, but you're right.

The area of a 13in is roughly 132.7, the area of a 15in is 176.7

132.7/176.5 = .75. or 75%

So they really did just con them out of 25% of their pizza.
gpt
It’s even worse than that because the crust part is an inch no matter what the pizza size is. So it’s really 11” circle vs 13” of what matters.

71%