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d=70
r=35
Vtabung =
385000 =
385000 = 3850 . t
t = 385000/3850
t= 100 cm
2. Vtabung 21560
t = 35
Vtabung =
21560 =
21560 = 110 . r^2
r^2 = 21560/110
r^2 = 196
r =
r = 14 cm
d = 2.r
d = 2.14
d = 28 cm