Answer Posted / md gulam moinuddin

As our friend mr ketan khatri had given the correct

explanation for finding the wt/m of any dia (but slight
correction i need to add to that ie, insteed of 164 it is
162) hence using formulae

wt /m (of any dia)=(suare of diametre of that dia)/162

That dia indicates ,the dia for which u need to find the
wt/m

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