Radius x Radius x Pie (3.14) X height in feet X .8 X test weight divided by 56
10.5 x10.5 = 110.25 x3.14 = 346.185 cubic ft. per foot x .8 = 276.948 bushels per foot of 56 lb. test weight corn
267.057 bushels per foot of 54 lb. test weight corn.
297.46 bushels per foot of 58 lb. test weight corn.
Sorry about bringing up test weight, but it matters.