Before you order that pizza deal, you may want to check if you're actually getting more pizza!
Because the area of a circle is equal to π*r2, it turns out that 1 18" pizza is more than two 12" pizzas by 28 square inches, or roughly a slice of pizza. #TheMoreYouKnow
Thank goodness that's settled. Of course if you live with someone that likes pineapple on pizza, 2 pizza deal is better so you can get a good one instead of pineapple, obvs.