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For example, by calculating the surface of a circle, using an integral.
Yes, you could if you knew the exact value for pi as well as the diameter of the circle. Multiply the diameter by the exact value for pi to get the circumference. However, it is impossible because the exact value for pi is not known. It is only known to about a trillion decimal places, but the exact value is not known.
The numerical value of pi is often found using a Taylor or Maclaurin series (Taylor series centered at 0).
The value of pi (Ï€) is3.1415926535897932384626433832795028841971693993751.........
No one has fully discovered pi. Pi is believed to be irrational.