Submerge it in water and determine the volume (in cubic centimeters) that it displaces. That will be the volume of the nugget.
The volume of a gold nugget can be expressed in cubic units because volume measures the amount of three-dimensional space an object occupies. Cubic units, such as cubic centimeters or cubic inches, are derived from the multiplication of three linear dimensions (length, width, and height). Since the gold nugget has a definite shape and size, its volume can be accurately calculated and represented in these units. This allows for a standardized way to quantify the space it occupies regardless of its irregular form.
I'm not so sure you can, until you tell me something about the method.
Gold nuggets (Or anything that exists, for that matter) are in the third dimension. They have length, width, and height. For two dimensional objects, the area is expressed in square units, but because the gold nugget is in the third dimension, it's volume is expressed in cubic units.
liter and cubic centimeter
liter and cubic centimeter
liter and cubic centimeter
cubic or cubed
Some units are the cubic meter, the cubic decimeter (= liter) and the cubic centimeter (= milliliter).
cubic centimetres, litres, cubic metres.
Units that cannot be used to express volume include units of time (such as seconds or hours) and units of angles (such as degrees or radians). Volume is typically measured using cubic units like cubic meters or cubic inches.
From your question, it is difficult to determine why you can express the volume of a 12-sided object in cubic units. We do not know the measurements or method to which you are referring.
cubic measures such as cubic feet, cubic meters