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That's the formula for circumfence, not area.

Ahhhh, of course. facepalms

It's still a good proof that the smaller pizza's have more crust.

Area is calculated using pi*r^2:

2 * pi * 6^2 < pi * 9^2

Thank you. I feel kind of stupid now.

it's true but really what they're missing is the number and variety of toppings on these pizzas.

Variety maybe, but surely number is also proportional to area (and presumably it's worse because "crust width" doesn't scale with diameter?)

well not if the big one is a margherita pizza.