Answer / priyanka

weight= density x volume

=density x l mt length x area
=7850x1x(22/7)x(dxd/4)
=(dxd)/162.287

Answer / yog

Its derived from the formula cross sectional area off bar in mm multiplied by length 1mt multiplied by density of steel 7850 per meter cube.example for 10 mm bar = 0.010mts bar
Weight per meter=Π×(0.01)^2×1mts/4
=d^2/162
=0.617kg

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