A circle is simply an ellipse with coincident focii.
It is the result of cutting across the cone parallel to the base.
The fact that I am captain of my school's math team should be source enough.
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Your quesion makes no sense. Please elaborate, and i will do my best to provide an answer. You need to tell me what your are comparing polygons to. Ex: What are 4 thing polygons and CIRCLES have in common. your sentence lacks that.
Please don't write "the following" if you don't follow it by a list.
please give me the answer of sources of error in person perception
The answer depends on what x is supposed to be. Please edit the question to include more context or relevant information.
please answer