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r kerucut: x
t kerucut: 2x
r tabung: x
t tabung: 3x
r bola: x
vol kerucut: 8L
vol kerucut: ⅓πr²t
8 = ⅓πr²t
8 = ⅓π.x².2x
12 = π.x³ (biarkan)
vol tabung: πr²t
vol tabung: π.x².3x
vol tabung: 3.π.x³
vol tabung: 3(12)
vol tabung: 36
vol ½ bola caranya sama