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.
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Surface area = 2*(3*4 + 4*5 + 5*3) = 2*(12 + 20 + 15) = 2*47 = 94 sq ft.
(2 x 3 + 2 x 3 + 3 x 3) times 2 ie (6 + 6 + 9) x 2 = 42ft2
The surface area of a box is the sum of the areas of the individual faces. If that's what you said, then there is no difference.
No, they are two different things. Area encompasses the total object while Surface Area only encompasses what it implies. For instance, if you had a box, the Area would be the total size of the box, while Surface Area would only indicate the size of the top of the box. no. area is Lenth times width and surface area is what the area of the whole object.
The front surface of a box is a rectangle. If you only need the area of the front surface, then it doesn't even matter what it's part of. Multiply the width of the surface by its height. The answer is its area.