One 18 inch pizza has 'more pizza' than 2 x 12 inch pizzas!

(via @fermatslibrary)

@infobeautiful The more interesting question is whether it has more non-crust pizza.
@dalias @infobeautiful The answer to that question would also be yes (assuming width of the crust was the same): circumference of an 18 in dia pizza (d times pi): approx 56 1/2 in; circumference of two 12 in dia pizzas: approx 75 1/2 in.

@dalias @infobeautiful

Not sure if you understand how pizza works? There's crust under ALL of it (100%). 🍕 😉

@infobeautiful The real question is why on earth do people eat baked cardboard?

@infobeautiful This is why I always insist on buying an 18" pizza to share with friends who think it's cheaper to take advantage of the two-for-one offers on smaller pizzas.

There's a mathematical reason why those offers exist. You only imagine you're getting a good deal! 😆🤷🏻‍♂️

@infobeautiful they should start selling pizza by area
@fullywoolly @infobeautiful Reminds me of the time a burger place started doing "1/3lb burgers" to one-up the 1/4lb burger. Wasn't popular, cos 3 is clearly smaller than 4.
(No idea if any enterprising soul tried the £50 "1/9lb burger")
A&W Restaurants - The Truth About A&W's Third-Pound Burger and the Major Math Mix-Up

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@tpfto @_thegeoff @infobeautiful I'm not even surprised but still saddened. I feel like if they had said "⅓ lbs ... more burger same price" that would have been enough or make it visual with a ruler or a quarter vs 33 cents.
@_thegeoff "That's cuz 3 is a smaller nummer than 4! Y'all can't fool me with yer FRACTIONS!" @fullywoolly @infobeautiful

@infobeautiful What's fun is that if all you care about is the ratio, you can dispense with the pi and just do this with squares:

(18^2)/(2*12^2) = 9/8 = 1.125

Same as the answer you got with the circles, but easier to calculate. You can even do it in your head! It works because in both cases we're scaling uniformly along two dimensions.

@infobeautiful
Math -- or maths -- learning how to do it can have real-world consequences and/or benefits.
@infobeautiful But two 12" pizzas seem to have twice as many salami slices 😂🥰

@infobeautiful In earlier days when eating pizza indoors with friends and strangers wasn't as harrowing, I more than once had an argument over this with people.

"But we can get four mediums for the same price as two extra larges!"

"Ok but there is much more pizza with the extra larges."

"But it's FOUR, it's MORE pizzas!"

"Yes, but they're less than half the size."

(Arguments as circular as pies ensued.)

According to @infobeautiful's illustration, two 12 inch pizzas have twice as many pepperonies as one 18 inch pizza :)
@infobeautiful that's counterintuitive... (on the other hand it's somehow very obvious that small pizzas are really bad value for money compared to medium or large)
@infobeautiful ich habe vor Jahren ein Pizzagrößenvergleichs-Excelsheet erstellt, um den günstigsten Preis/cm² zu ermitteln.
@infobeautiful @Guillotine_Jones Damn, this should be a required exercise in maths class.
@infobeautiful You also see this in car rims where just 1 or 2 inch larger rims can have significantly more rotational mass.

@infobeautiful it's important to note that when the object you're measuring is a pizza, the radius is properly denoted with z and the height (altitude) with a

because its volume is pi * z * z * a

@infobeautiful @Barbramon1

Yep I think about pizza per square inch, because the next size up is only a couple of bucks difference, and you could do a price per square inch analysis.

Nope, I have never done that analysis. I just think about it every time I pick up a pizza.