That might be right. But even then, the biggest black hole we think is possible measured down to the planck length gives you a number with 50 digits. And the

That might be right. But even then, the biggest black hole we think is possible measured down to the planck length gives you a number with 50 digits. And the entire observable universe measured in planck lengths is about 60 digits. So how are you going to get a physical pi of even a hundred digits on the path toward arbitrary precision?