Jawabanmu

2014-05-18T12:19:37+07:00
1 inch=25 mm
diametr 12 inch = 30 cm
panjang 6 m = 600 cm
volume luar= 3,14.15^2 .600=423.900
volume dalam = 3,14.(13,8)^2 .600=358.788,96=358.789
berat = 423.900-358.789=65.111 cm^3=65.111 gr=65 kg