Each face of a box is a rectangle .
The area of a rectangle is (its length) times (its width).
Measure the length and width of each face, and multiply (length times width).
If you think about what you're doing, and plan it carefully, you only have to make
three measurements and you'll have the whole box covered ... all six faces.
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This might be a long answer, but let's try. Suppose the width, height, and length of the box are l, w, and h. The area of one face is l*w. The area of the second face is w*h. The area of the third face is l*h. Multiply these three equations together. Whatever the product is will be equal to l2w2h2. Take the square root of this product to get lwh, the volume of the box.
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.
find the area of each side and add them together.
Such a box has four sides each with an area of 8 cm2 and two end each of are 4 cm2 for a total of 36 cm2 , assuming the box has a top and you want only the outside area.
No. A rectangle is a 2-dimensional shape. Each face of a box may well be a rectangle but the box, itself, is probably a cuboid.