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r tabung= 7cm
Vol bola= 4/3πr³
= 4/3 x 22/7 x 14³
= 11.498, 67cm³
vol 1/2bola= 1/2x11.498,67=5.749,33cm³
πr² t = Vol. tabung
22/7 x 7² xT =5.749,33
154 T = 5.749,33
T = 5.749,33 /154
T= 37,33 cm
atau bila dalam pilihan ganda 37 1/3 (a)