what is the difference of circumference of the cir
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No real difference. Circumference is mostly used to denote the length of the perimeter of a circle or even another closed figure. You can say the cicumference of an object is a circle, or an ellipse. It's all just interchangeable parlance, with the circumference of a circle often used to distinguish from its area.
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The circumference of a circle is its perimeter, i.e. the length of its outer boundary - which is one-dimensional and proportional to its diameter (which is twice its radius). The area of a circle is two-dimensional area enclosed by its circumference (or perimeter), and is proportional to the SQUARE of the radius.
2¶r^2
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