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

Answer» LENGTH of ROD , l = 90 cm
diameter of rod , d = 1.4 cm
so, radius of rod , r = 1.4/2 = 0.7 cm
volume of rod = πr²l
= 22/7 × 0.7 × 0.7 × 90
= 22 × 0.1 × 0.7 × 90
= 22 × 0.7 × 9
= 198 × 0.7
= 138.6 cm³

HENCE, 138.6 cm³ iron is needed to make a rod of length 90 cm and diameter 1.4 cm.


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