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L.linakaran=3,14.r2
diket: t= 105cm d= 80cm (r=40cm)
L.alas tabung=3,14.40kuadrat= 3,14.1600=5024cm2
v.tabung= 5024.105=527520cm3
=3,14x40x40
=5024
V=Laxt
=5024x105
=527520 cm (kubik)