Answer Posted / c.m.vijaya kumar

dead weight of steel is 7850 kg/cum
formula
(area of bar) x (1 metre of bar) = volume of bar

(3.14/4 x d/1000 xd/1000) x 1 metre = volume of bar

(0.000000785 x d xd)cum (dia convert to metre)
1 cum of steel is 7850 kg

so (0.0000007845 xd xd) cum of steel bar is
(0.000000785 x d x d) x 7850 =0.006162 x d x d
8mm bar 1m wt is 0.006162 x 8 x 8 = 0.394368kg

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