By multiplying it by a given 3rd dimension
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A derivative is to the rate of change asan integral is to area/volume.
If the length of an edge is x, the volume is x3 To find the rate of change of the volume with respect to x, differentiate: d(x3)/dx = 3x2 The area of one face is x2 There are six faces so the total surface area is 6x2 Therefore the rate of change of volume, 3x2 , is half of 6x2 , the surface area.
Change in height and circumference
Square Cm is a unit of Area. Cubic Cm is a unit of volume. You can't change areas into volumes, just as you can't change weight into length. They are different types of measurement. . If you know the size of an area, and if, and only if, that area has a thickness that you can measure, then you can calculate the volume. But, you do not 'convert' it to a volume, you calculate it's volume . To calculate volume you need 3 measurements, length, width, height. To calculate area you need only 2 measurements , length ,and width.
To obtain the ratio of surface area to volume, divide the surface area by the volume.