If it's rectangular, you need to multiply length x width, to get the area. If the sides are expressed in cm, the area will be in square cm.
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The answer depends on how many sides the shape has. For each number of sides (≥ 3), there is a shape that will meet the requirements of the question.
The bottom, the top, and two of the sides are each 50 cm2 . The remaining two sides are each 25 cm2 . All together, it takes 250 cm2 of cardboard or wood panel to make the box, and if you paint the entire inside and outside, you have to paint 500 cm2 .
Each side has surface area of 3X3 = 9 cm 6 sides X 9 cm/side = 54 cm
Yes, easily.
Each side is 11.6 cm X 11.6 cm, or 134.56 cm, X 6 sides = 807.36 cm.