It is the area of the 2-D figure.
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Are determined by (a) the shape of the flat surface, (b) the area of the flat surface, and (c) the size of the square units.
The answer is 5.5 cans. You figure this by basic division: (2200 units) / (400 units per can) = 5.5 cans which means you have to buy 6 cans.
TilesAny shape can be covered with a number of similarly shaped figures such as triangles, this process is called tesselation.
because you are just measuring the outside faces, therefore it is only measured in square units