The amount of pizza in a 18" pizza compared to two 12" pizzas is freaking people out
Pi r squared
Apparently loads of people didn't pay attention in GCSE maths, as they are astounded that the area of a 18-inch pizza is bigger than the area of two 12-inchers.
An 18-inch pizza has 254 square inches of pizza, whereas two 12-inch pizzas only have around 226 square inches.
The classic way of working out the size of a circle is dividing its diameter by two to work out the radius, then squaring it and multiplying it by pi. Which works out the total area of the circle (or pizza).
Here's a useful counterintuitive fact: one 18 inch pizza has more 'pizza' than two 12 inch pizzas pic.twitter.com/hePSpG0pJs
— Fermat's Library (@fermatslibrary) January 7, 2019
The amount of multiplication means that small changes in the diametre of the pizza lead to much bigger changes in the area.
A 10-inch pizza, for example, is 78 square inches, with a 12-inch pizza a comparative 113 square inches. A 14-inch pizza comes in at 153 inches, so roughly the same size as 10-inchers.
All of this is worth bearing in mind when you're ordering and working out the most cost-effective option.
And, judging by social media, a lot of people's minds were blown:
— Mark Sykes (@MarkSykes15) January 7, 2019
And 12 + 12 = 24 which is more than 18. This must be quantum physics. I hear all kinds of strange things happen there.
— Scott Eisenberg (@rscotteisenberg) January 7, 2019
You're not encouraging me to eat smaller pizzas, here... pic.twitter.com/HEBoEqxdVm
— Chris Constantine-Armstrong (@DrCDArmstrong) January 7, 2019