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diameter = 4x
r = 2x
V = πr²t
V = 502, 4 cm³
502, 4 = 3, 14 × (2x)² × 5x
502, 4 = 3, 14 × 4x² × 5x
502, 4 = 62, 8 x³
x³ = 8
x = 2
d = 4x
d = 4×2
d = 8