A few questions about pi, can the center or diameter of a perfectly round circle be found if pi is unknown

If the center and diameter can be found then pi is finite. Also does pi grow or shrink as it is further calculated, is it headed toward infinity or negative infinity, pi being finite? If pi is infinite, then is roundness possible or just another abstraction, existing only in the mind? You might also have to prove that whole numbers exist. We live without roundness so maybe it is not important.

Let me guess... this comes from a philosophy book or teacher ?
They are sometimes (if not often) famous for " garbage thinking ".

Pi approaches neither + or - infinity.
The number of decimal places in pi is infinite, not it's value.

Pi is an exact value that doesn't get larger or smaller.
It's calculated value grows and shrinks as decimal places are added,
but by incrementally smaller amounts.

Pi is a ratio between a circles circumference and it's radius or diameter.
It has little to do with finding a center.

x^2 + 4x + y^2 + 6y - 7 = 0 <=== equation of a circle (note the lack of pi)

It's exact center is at the point (- 2 , - 3 )

... and yes, mathematically it's a perfect circle.

Can one draw or build a perfect circle?
Of course not, but circles really do exist.

>> You might also have to prove that whole numbers exist. <<

Yep ... gotta be philosophy.

My God, you will make me MAD.
Pi is infinite, but practically we get our solution. It is enough to take 4 digits after decimal.