What does circumfrence mean?

Answer 1

Circumfrence is the perimeter of a circle, the line that makes a circle looks like a circle

Imagine a perfect circle drawn on a piece of paper. Take the length of the line of the circle (by line I mean the part that is actually drawn on the piece of paper the ring) and there, you have the circumfrence. The circumfrence is exactly π times the size of the diameter (if you don't know what those two things are ignore this)

Answer 2

It means the distance all the way around a circle, like an ant walking on the line.