Unit weight of steel is d square/162. How is it derived?

Today i will prove Dsquare/162 friend most of friend asking about this formula but they don't know how to proves that. Here i will proves that D2/162.25.

Unit weight of steel is d square/162. How is it derived?

By this formula you can calculate unit weight of Steel in Pound (lbs). This is a constant formula mostly this formula is using for steel weight calculating.

Area of Steel Rod =  πr^{2
                                   [D=2r =r=D/2]}

                                           πD²/4

Volume of Steel Rod
              = Area x Length
              =  πD²/4 x 1000
Density of Steel = 7850 Kg/Cubic Meter
             7850/1000x1000x1000 Kg
Weight of bar per Meter = Volume of steel x Density of Steel
     =πD²/4 x 1000 x 7850/1000x1000x1000
       = 3.14D2/4 x 7850/1000x1000
     =   0.785D x0.007850
     =   0.00616225 x D2
      =  0.000616225/1 x D2/1
        = D2/1/.00616225
Weight of Bar per Meter = D2/162.28

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