Question

A metal cube of length 14 cm is melted io form a cylindrical wire of diameter 0.84.What is the length of wire obtained

Answer 1

area of cube = 14X14 =196
daimeter given =0.84
area of cylinder = 2/pi r h 
so 2 x 22/7 x 0.42 X h = 196
26.4 h=196
h= 1960/264
h=7.42 
so length is 7.42