If you look up the United States, for example in the Wikipedia, you will eventually find a map of the U.S. Then you will know what it looks like.
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It is a rectangle.
Since you haven't provided us with the shape, we couldn't hazard a guess.
Genetic and environmental factors shape us as individuals.
There is insufficient information for us to answer this question. Density = Mass / Volume. For a regular shape, the volume can be determined from a formula - which will depend on the shape. However, you still require the mass for which there is no information.
Stop sign is a regular octagon in the US It depends on which country you are in