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Verified answer
V1 = π × r² × t= 22/7 × 3,5 × 3,5 × 20
= 770 cm³
V2 = π × r² × t
= 22/7 × 10 × 10 × 7
= 2200 cm³
selisih V2 - V1
= 2.200 cm³ - 770 cm³
= 1.430 cm³