AAQ, When it comes to PI, see https://www.theyeshivaworld.com/coffeeroom/topic/chidushim-on-daf-yomi-eruvin, reply #1895845, I am also a mathematician but not a PhD. FYI The Rash in Kilaim 5,5 quotes the Pythagorean Theorem under Chachmei Hamidos. There is a book available in Amazon called
Rabbinical Mathematics and Astronomy by W. M. Feldman and GRA’s sefer Ayil Meshulash is available at hebrewbooks,org.
