A cylinder of max. possible area is made out of a solid wooden cube. How much material is lost in this process ? (in %)

Question

Answer 1

volume of cube = a^3
Volume of new cylinder= pie r^2 h
r = a/2
Now solve it.

Answer 2

volume of cube = a^3
Volume of new cylinder= pie r^2 h
r = a/2
Now solve it.

Answer 3

volume of cube = a^3
Volume of new cylinder= pie r^2 h
r = a/2
Now solve it.

Answer 4

volume of cube = a^3
Volume of new cylinder= pie r^2 h
r = a/2
Now solve it.

Answer 5

Near about 20.25%...

Answer 6

Near about 20.25%...