Unit weight = D² ÷ 162 = 12² ÷ 162 = 0.889 kg/m (rule of thumb)
Exact: π/4 × D² × 7,850 kg/m³ = 0.888 kg/m
Total length = 12.00 m × 1 = 12.00 m
Weight = 0.888 × 12.00 = 10.65 kg
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