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Presumably, they are 2, 6 and 4!
2 x (8 + 6), ie 28 ft.
It depends on what you mean by height - are the coins stacked or arranged side by side? If they're side by side, the dimension is 6*21.21 mm = 127.26 mm If they're stacked, the dimension is 6*1.95 mm = 11.70 mm
192ft squared
As asked, this question is meaningless. 6 cm and 2 cm are linear dimensions. Their product gives an area of 12 cm2 (square centimetres), but this is still one dimension short of volume, which has cubic units of dimension (say cm3, cubic centimetres). Unless you intend "cm" to mean "cubic metres" - in which case the sum is 8 m3.