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πd (360-120)/360= 24π 2/3 = 16π
keliling busur lingkaran tsb merupakan keliling lingkaran alas
πd = 16π
d= 16
r = 8
jari2 alas, jari2 lingkaran selimut, tinggi kerucut membentuk segi3 siku2 dgn sisi miring adalah jari2 selimut
t = √ (12^2 - 8^2)
t = √ (144 - 64)
t = √ 80
t = 4√5
V kerucut
1/3 πr^2 t
1/3 π64 4√5
256/3 √5 π