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9.240 = 1/3. 22/7. 21.21.t
9.240 = 308 t
t = 9.240 : 308
t = 30
maaf kalau salah
9,240=1/3×22/7×21²×t
9,240×3=22/7×21²×t
27720=1386t
t=27720/1386
t=20 cm