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V = Pi × r^2 × t
6.930 dm = 22/7 × r^2 × 5 dm
r^2 = (6.930 dm ÷ 22/7) ÷ 5
r^2 = 2.205 dm ÷ 5
r^2 = 441 dm
r = √441 dm
r = 21 dm
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