A copper solid cyliender of radius 14 cm and height 10 cm is melted and recast into cylienderI called wire of diameter 4mm find the length of the copper wire

Answer 1

That's cylindrical, not cylienderI called
Anyway, if the wire is of length x cm, then you need the volumes to be equal:
14^2 * 10 = 0.4^2 * x
now just find x.

Answer 2

close, but ... 14 cm is the RADIUS of the cylinder,
... while 4 mm is the DIAMETER of the wire

14^2 * 10 = (0.4 / 2)^2 * x

Answer 3

Dang! Way to watch!

Answer 4

man, this is not my day!
I gotta go...