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v. tabung=3,14×10,5×10,5×28
=3,14×110,25×28
=3,14×3.087
=9.693,18
ket=diameter 21. jari² setengah dari diameter
t= 28 cm
π=22/7
maka
v= π x r x r x t
v= 22/7 x 10,5cm x 10,5cm x 28cm
v= 67914/7 cm3
v= 9702cm3