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42 : Diameter
Maka Jari -jari = 42:2 = 21
Luas alas = 22/7 x 21 x 21 = 1.386
Volume 1/2 Tabung :
Luas alas x Tinggi
1386 x 90 = 124.740
124.740 : 2 = 62.370
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