How to do it

Dear Student,

Diameter of copper wire =1 cm

Radius  cm

Height of copper rod =Length of copper rod =8 cm

Volume of rod 

Let the radius of wire be ‘r’ cm

As 1 m = 100 cm

length of the wire=Height of the wire =18 m =1800 cm
As rod is converted into wire,Therefore, 

Volume of cylinder wire = Volume of cylindrical rod

As radius cannot be negative,

⇒ r = 0.033 cm
Hence thickness of the wire is 0.033 cm.

⇒ r2

⇒ r  cm
Now, thickness of wire = diameter of wire = 2r = 2(1/30) = (1/15) cm

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