... (2 * Cut Out) * Width - (2 * Cut Out) * Height Using a square, both the length & the width are equal. I am using a length/width of 20cm. I am going to call the cut out "x." Therefore the equation can be changed to: Volume = 20 - (2x) * 18 * x If I were using a cut out of length 1cm, the equation for this would be as follows: Volume = 20 - (2 * 1) * 20 - *(2 * 1) * 1 So we can work out through this method that the volume of a box with corners of 1cm² cut out would be: (20 - 2) * (20 - 2) * 1 18 * 18 * 1 = 324cm³ I used these formulae to construct a spreadsheet, which would allow me to quickly and accurately calculate the volume of the box. Below are the results I got through this spreadsheet. As ...

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