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v=3140dm3=31400cm3
mencari jari2
v= pi. r.r .t
31400=3,14 . r.r .100
31400=314.r.r
31400/314=r.r
100=r.r
akar100=r
10=r
mencari luas
l=pi .r.r
=3,14.10.10
=314