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r tabung=r bola = ½d=½.2r =r
t tabung = 5 d bola= 5.2r=10r
Ruang kosong=Vtabung - 5.Vbola
Rk=πr² t - 5 (4/3 πr³)
Rk=πr² (10r) - 20/3 πr³
Rk=10πr³ - 20/3 πr³
Rk=(30/3-20/3)πr³
Rk=10/3 πr³
Rk=10/3. 22/7 r³
Rk=220/21 r³
Rk=10,47 r³ cm³