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= 3,14 . 30 . 30 . 100
= 314 . 90
= 28.260 cm3
4. V tabung = phi . r2 . t
1540 cm3 = 22/7 . r2 . 10
1540 / 10 = 22/7 . r2
154 / 22 . 7= r2
r = √ 7 . 7
r = 7 cm