Question

how much iron is needed to make a rod of length 90 cm and diametar 1.4cm?​

Answer 1

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Answer 2

Answer:

Given: For cylindrical rod: length of rod (h) = 90 cm and diameter (d) = 1.4 cm

Required to find: Iron required to make a rod

We have, diameter (d) = 1.4 cm

⇒ radius (r) = d/2 = 1.42 = 0.7 cm

Volume of rod = πr²h

= (22/7) x 0.7 x 0.7 x 90

= 22 x 0.1 x 0.7 x 90

= 138.60 cc

Thus, 138.60 cc of iron is required to make the rod.