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640π=πr²*10
640=r²*10
r²=64
r=8
srednica=2r=2*8=16
h - wysokość = 10 cm
V = Pph
Pp - pole podstawy = V/h = 640π/10 = 64π cm²
Pp = πd²/4
d - średnica podstawy walca
Pp = πd²/4
4Pp = πd²
d² = 4Pp/π = 4 razy 64π/π = 256
d = √256 = 16 cm
odp
d = 16 cm