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628cm = 125,6 + t
t = 628 ÷125,6 = 5 cm
v tabung = 3,14 × 20 × 20 × 5 = 6280 cm3
Lst=πd×t
628=3,14×40×t
628= 125,6×t
t= 625/125,6
t=4,976
dibulatkan menjadi 5 → t = 5
V=3,14×20×20×5
=3,14×400×5
= 3,14×2000
=314×20
= 6280
semoga bermanfaat