Pi is provably irrational. But your paper presents pi as a rational, terminating decimal.

Your paper is false. QED.

Here are four proofs of the irrationality of pi. The idea that pi would be a finite decimal in base 10 is particularly wild and hard to believe.

https://medium.com/mathadam/nivens-proof-%CF%80-is-irrational-cea11f383bb7

https://www.cantorsparadise.com/proof-that-is-irrational-14999bdef228

https://www.cantorsparadise.com/understanding-the-irrationality-of-%CF%80-6e505a54f3f7

https://www.cantorsparadise.com/how-to-prove-that-e-is-irrational-7a04cb06f3d6