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.
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The length of the perimeter is the circumference. The perimeter itself is the boundary between the interior and exterior of the circle. The perimeter of a circle is called the circumference
Circumference is only used for circles. Perimeter is for every other 2D shape.
There isn't any. The circumference is just a special name for a perimeter of a round shape.
The perimeter of a circle is its circumference
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.