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r=10cm
Hw=50cm
a=25cm
b=40cm
Vwalca= πr²H
V= π*10²*50= 5000π cm³ <- objętośc walca
5000π≈15700cm³
Vpros=abc
V= 25*40*c
15700=25*40*c
15700=1000c
c ≈ 15.7