hello .. I neeed your help (again). I have to make an calculation of the surface and I have the following dates
Diameter (columns)
Thicknesses (rows)
then, the calculation need to be drop in an excel range, I think it is something like this? or I am far away from VBA reality

'array dia.
Dia(1) = "21"
Dia(2) = "28"
Dia(3) = "34"
.
.
etc
'array tk
tk(1) = "1.2"
tk(2) = "1.4"
tk(3) = "1.8"
.
etc

Formula(1) = Dia(1)*2*tk(1)*Pi()
Formula(2) = Dia(1)*2*tk(2)*Pi()
Formula(3) = Dia(1)*2*tk(3)*Pi()
.
.
.
Formula(n) = Dia(3)*2*tk(3)*Pi()

how can I approach this subject? thx for the advises
ps. I do not have an data sheet for example ..and the correct title will be: combination