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tingggi air = 1,4meter = 140cm
v = la . t
704000 = 22/7 . r² . 140
704000 . 7/22 : 140 = r²
r² = 1600
r = 40cm
lp nya tabung = luas alas + luas tutup + luas selimut
lp = ² + ² + 2
lp = 3,14 . 40² + 3,14 . 40² + 2 . 3,14 . 40 . 140
lp = 5024 + 5024 + 35168
lp = 45216cm2