tolong yah di jwb pakai cara jgn ngasal.

12. klo diameter alas = 10 berarti jari-jari = 1/2 x 10 = 5 cm
      Volume = 3.14 x 5 x 5 x 50 cm = 3.925 cm3

13.Volume Balok = 28 cm x 28 cm x 20 cm = 15.680 cm3
     Volume Tabung = 22/7 x 14 cm x 14 cm x 20 cm = 12.320 cm3
 Volume Gabungan = 15.680 cm + 12.320 cm = 28.000 cm3