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2 x (3 x 3) + 4 x (3 x 4) = 2 x (9) + 4 x (12) = 18 + 48 = 66 square feet==> IF the box is sealed, i.e. the top is closed, so there are six sides to it.
(2 x 3 + 2 x 3 + 3 x 3) times 2 ie (6 + 6 + 9) x 2 = 42ft2
None. It is a hole and therefore contains nothing.
Depends on if your talking about a 'square yard' or a 'cubic yard'. A 'square yard' has 9 square feet (3ft x 3ft). A 'cubic yard' has 27 square feet (3ft x 3ft x 3ft)
Yes, using two 3ft x 3ft tiles.