sphere ( what type informations required?)

Question

dia = 18', h=8.5'

find the surace area of sphere, and if its wall thickness is 3" find the volume ?

Answer 1

spheer area=(4/3)pi r^3=(4/3)pi*18^3

=5832*(4/3)*3.14159265

=18,321.76833

### 3 inch shell..(1/4)ft *18,321=4580

Answer 2

surface area = 2*3.142* radius *h

                       = 2*3.142*9*8.5=480.72 Sft, volume = 3.142*h*h(r-h/3)=1400 cft,

but if  circumfrence layer 3 " thick then volume of layer is area x thickness= 480.72*.25=120.18 Cft.........................(pakistan zinda bad)