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h=10 cm
ρ=m/V
V=m/ρ
V=314g/ 1g/cm3
V=314 cm3
V=Ah
314 cm3=A10cm2
A=314cm3/10cm
A=31,4 cm2
A=π
31,4=3,14
=31,4/3,14=10
r= cm
r=3,16 cm