It is the area of its foot-print.
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a polygon
A square centimeter is an area ... a definite amount of the surface of a tabletop,a wall, a piece of paper, a floor, a board, a cloth, a ball, etc.It can be long and skinny, round, oval, triangular, or have a wiggly and irregular outlinelike a blob. But the total amount of surface that it covers is always the same amountas a square with sides that are 1 centimeter long. No matter what shape it is, it takesthe same amount of paint or glue to cover it.
you need measurements to figure out surface area. the simplest way to figure out the whole area of a dodecahedron is to find the surface area of one pentagon, then multiply by 12 (the number of sides of a dodecahedron)
Cone
It depends on the type of figure. If it is a 2D figure, then it is called area. If it is a 3D figure, then it is called volume.