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PI, not pie!!
just plug in your value for r:
4/3 π * 4^3 = 256/3 π mm^3
But 1L = 1000cm^3 = 10^6 mm^3
so, v = 256Ï€/3000 = 0.268L
or, you can convert 4mm = 0.4cm first, and then
v = 4/3 π * .4^3 = 0.268L