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In terms of fluid capacity, a shape with a volume of 4,000 cm3 could hold up to about 1.056 US gallons.
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.
1/2 of (180 minus the one you didn't tell us the size of or even what shape you're talking about)
It is a rectangle.
Since you haven't provided us with the shape, we couldn't hazard a guess.