Jawabanmu

2014-09-09T19:36:14+07:00
1188 = 2.22/7.r.9
378 = 2.9.r
21 = r

B. V = 22/7.21.21.9
V=66.21.9
V=66.3.7.9
V=1386.9
V=12474 cm^3
2014-09-09T19:36:29+07:00
A.1188=2.phi.r.t
1188=2.22/7.r.9
1188=56,57.r
r=1188/56,57=21,00053(dibulatkan)=21cm
b.vol=phi.r².t
vol=22/7.21².9=12474cm³

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