That would have to be cubic cm. 216 of them.
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9 sq cm
Assuming you mean 3 cm per edge.1 side = 3 x 3 = 9 sq cm.6 sides total = 9 x 6 = 54 sq cm.
Assuming external area is the surface area. 2 x 6 x 4 = 48 sq cm (top and bottom area) 2 x 6 x 4 = 48 sq cm (two sides) 2 x 4 x 4 = 16 sq cm (two ends) 48 + 48 + 16 = 112 square centimetres is the total surface area.
Area = 0.5*(9 + 3)*11 = 0.5*12*11 = 66 sq cm
1 sq in = 6.452 sq cm