Question is very vague, I'll give it a try.
If we know the exact volume, to be V=500 π , this means that an approximate value pi is intended.
The following are approximate values of pi
π = 3, V=1500 cm^3 (1 significant figure)
π = 3.1, V=1550 cm^3 (2 significant figures)
π = 3.14, V=1570 cm^3 (3 significant figures)
π = 3.14, V=1570 cm^3 (3 significant figures)
π = 22/7, V=1571 cm^3 (3 significant figures)
π = 355/113, V=1570.796 cm^3 (7 significant figures)
...