Actually, pi is an abstract ratio. The real ratio does change based upon the size of the gravitational or acceleration field.
In the accelerating frame, though, measurement of a circle would get pi. If you were in a frame stationary to an accelerating circle, the circle would look oval (if it were oriented correctly).
I don’t think pi changes with gravity, but that’s an interesting concept.
I was thinking of an area of space where if you measured a circle you’d get 3.00000. Lok at all the physical calculations that involve pi! They’d all be different, including the behavior of inductors.
Huh?!? It's a physically measurable value.