Q2 of 12 Page 112

How much iron is needed to make a rod of length 90 cm and diameter 1.4 cm?

Given,


length/height of the cylindrical rod = 90 cm


The radius of rod


Here, we need to calculate the amount of iron required to make a rod.


That mean, we need to calculate the volume of the rod.


Volume of rod = π × r2 × h


= 3.14 × 0.72 × 90


= 138.6 cm3


∴ Amount of iron required is 138.6 cm3


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