The question is not specific enough for a sensible answer. It could refer to the ratio of the area of the shape to its perimeter or depending on its shape, the ratio of the area to the length of one or more of its sides.
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to obtain the ratio of surface area to volume, divide the surface area by the volume.
The answer depends on what the ratio is relative to!The ratio of a circumference to the area of a circle is half the radius.
You calculate the areas of two shapes and then divide one area by the other to find the ratio of their areas.
In a circle, the area of the circle is pi times the radius squared
Area ratio = (edge-length ratio)2 Volume ratio = (edge-length ratio)3 Volume ratio = (area ratio)3/2