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= 22/7 x 7² x 30
= 22 x 7 x 30
= 4.620 cm³
29. v. tabung = pi * r * r * t = 22/7 * 7 * 7 * 20 = 3.080 cm'3
v. balok = p * l * t = 20*18*8 = 2.880 cm'3
v. gabungan = 3.080+2.880 = 5.960 cm'3