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28 = 1/3 x vol tabung
vol tabung = 28 x 3 = 84 cm³
2. r bola = r tabung
tinggi tabung = 2 x jari jari bola
Vol bola : Vol tabung
4/3πr³ : πr²t (coret π dan r nya)
4/3 r : t ( krn tinggi tabung = 2r maka)
4/3 r : 2r
4/3 : 2
4 : 6
2:3