How much iron is needed to make a rod of length 90 cm and diameter 1.4 cm?
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Answer:
length of rod, l = 90cm
diameter of rod, d = 1.4 cm
so, radius of rod, r = 1.4/2 = 0.7cm
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 cm²
hence, 138.6 cm² iron is needed to make a rod of length 90 cm and diameter 1.4 cm
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