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tinggi = 30 cm³
luas alas = 18.480/30 = 616
r² = 616:22/7 = 196
r= √ 196= 14
diameter tabung kecil= jari jari tabung besar=14
v tabung kecil = 22/7 * r² * tinggi tabung
=22/7 * 7² *30
= C. 4620