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d = 18 cm ; r = 18/2 = 9 cm
π = 3,14 atau 22/7
v = ...?
V = 1/3 πr² t
= 1/3 × 3,14 × (9)² × 40
= 1/3 × 3,14 × 81 × 40
= 27 × 31,4 × 4
= 27 × 125,6
= 3391,2 cm³
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