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Pp =2 pi r
Pp = 2*3.14*3= 18.84cm2
18.84cm2 *100 cm = 1884 cm3 ebonitu
1,2 g ---- 1 cm3
x g ----- 1884 cm3
x = 2260,8 g = 2,2608 kg
r=3cm
h=1m=100cm
V=π*r²*h
V=π*9*100=900π
1,2*900π=1080π