What is D2/162 in Steel?

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As we know that weight of steel bar per meter = Volume of steel x Density of steel

Weight of steel bar per meter = πD²/4 x 1000 mm x 7850 kg/ 1000 mm x 1000 mm x 1000 mm

Weight of steel bar per meter = 3.14D²/4 x 7850/1000 x 1000 = 0.785D² x 0.00785

Weight of steel bar per meter = 0.0061622 x D² = D²/1/0.0061622 = D²/162.27

Hence Proved.

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Video Source: Sami Ullah Stanikzai