1. It has a radius.
2. It has a diameter.
3. It has a circumference.
4. It has an area.
5. It is two dimensional.
6. It lies in a plane.
7. It has no vertices.
8. It is a closed figure.
9. It has no volume.
10. It is delineated by a curved line.
11. The ratio of circumference to radius is pi.
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