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d=6cm
π≈3,14
r=1/2d
r=3cm=0,3dm
l=12cm=1,2dm
h=?
h²+r²=l²
h²=l²-r²
h²=1,2²-0,3²
h=√1.35
V=⅓π(0,3)²*√1.35=0,1094505094dm³≈0,1dm³
0,1dm³x100=10dm³
Odp. Potrzeba 10dm³ masy