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66 = 2 × 22/7 × r
66 × 7 = 2 × 22 × r
462 = 44 × r
r = 462 : 44
r = 10,5 cm
V = ⅓ × π × r² × t
= ⅓ × 22/7 × (10,5)² × 30
= 3.465 cm³