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diameter =
diameter tabung besar : 2
= 28 : 2 = 14 cm
tinggi =
30 - 20 (tinggi tabung besar)
= 10 cm
pi x r2 x tinggi
22/7 x 7 x 7 x 10
= 1540 cm
Tabung besar =
diameter = 28 cm
tinggi = 20 cm
pi x r2 x tinggi
22/7 x 14 x 14 x 20
= 12320
Volume gabungan bangun =
1540 + 12320
= 13860 cm
Jawabannya C. 13860