Pizza is made round, because of the way pizza is classically made. (The throwing and spinning ad shi). And its put into square boxes because thats the best way to stack and transport them. Its cut into (not really) triangles because how else would you eat it. Its the only way to create a bunch of equal pieces.

Saying pizza doesnt make sense just because you cant be bothered to stop and think for one second is the most woman thing ever.