Approximately 3 1/2 X 3 1/2 inches.
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4 x 4 and 6 x 3
2 x 6 x 4 = 484 x 6 x 4 = 96
4 x 24
If we denote the side of the square piece of cardboard with x, then the dimensions of the box are: height = 2 cm length = x - 4 cm width = x - 4 cm V = lwh = 392 cm^3 So we have: 2(x - 4)(x -4) = 392 divide by 2 to both sides; (x - 4)(x - 4) = 196 (x - 4)^2 = 196 x - 4 = square root of 196 (because the dimensions are to be positive) x - 4 = 14 x = 18 Thus the original size of the cardboard is 18 x 18 cm.
You can't tell the dimensions from the area. There are an infinite number of possibilities. Even if you accept only whole numbers (only feet, no inches), it could be 1 x 500 2 x 250 4 x 125 5 x 100 10 x 50 20 x 25