You will probably be given a problem similar to this on the STAAR. The reason why things like this are useful is for arts and crafts projects where part of an object has something done to it, like part of it is painted and the rest is not, or part of it has glitter on it, etc.
The estimated area tells us something about how much of a cover we need to get, so how many bottles of glittter or buckets of paint would be needed. This way we don't have to make extra trips to the store either to buy more or to return what we had that was too much.
This is not the only example of the use of this concept, but is one of the most clear. Other examples include washing windows on a building that isn't completely covered with them, figuring out how much floor wax to use when buffing a wood or tile floor, figuring out how much grass a sprinkler head would cover. I bet you can think of some others.
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