So I made the thing (so far), and got to see. I'll keep updating it occasionally. Then I'll upload the source to github too. (The source is the webpage itself, of course, but github will show the evolution.)
() plenty of places bake square pizzas but sell tips of them. The don't do it right though, they cut the tips at similar angles -same as on a round pizza- but that way the tips are not all the same size. I supose you have a formula to cut tips of the same size.