It is the perimeter of a circle
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The word for the distance around a circle is "circumference".
The circumference of a circle is the length around it.
The perimeter of a circle is its circumference.
You mean what Is the circumference of a circle? pi*(r)squared.
Nothing. They mean the same thing. Except in English, the word circumference is reserved for circles.I think for other strictly curved, enclosed shapes (I believe ellipses also have circumferences), but dont quote me.But otherwise any shape with a circumference also has an equivalent perimeter. Its just a word.