the volume of a 1 meter long rod is 1386cubic cm.find its diameter
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Given : Volume of rod = 1386 cu cm and height = 1 m or 100 cm
Volume of rod (iron rod is in the shape of cylinder) = πr²h
1386 = 22/7*r²*100
⇒ r² = (1386*7)/2200
⇒ r² = 9702/2200
⇒ r² = 4.41
⇒ r = √4.41
⇒ r = 2.1 cm
Diameter = 2.1 ×2
Diameter = 4.2 cm
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