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promien wewn. r=10cm
dlugosc rurki h=1m=100cm
1) V=πR²H
V=π×169×100
V=16 900π [cm³]
2)v=πr²h
v=π×100×100
v=10 000π[cm³]
3)V-v
V-v=16 900π-10 000π=6 900π[cm³]=0,69π[m³]
4)7,8×0,69π=7,8×0,69×3,14≈16,8995 g