Answer :

Given,


Height of cylinder R = 2.8m = 280cm


Radius =


Height of cone = 42cm


Volume of pillar = volume of cone + volume of cylinder


=






Given that,


Weight of 1 cm3 iron = 7.5gm


Weight of the pillar = 92400 × 75


Weight of the pillar = 693000g


= 693kg


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