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15 dm = 150 cm
V = 22/7.3,5.3,5.150
V =5775 cm3
jari jari 3,5 cm = 0,35 dm
panjangnya 15 dm
volume air = phi × r × r × t
22/7 × 0,35 × 0,35 × 15
= 5, 775 dm3 / 5,775 liter