a circle has 0 edges.
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a sphere has no edges. a circle has no edges.
An oval
circle, sphere and another shape do not have faces or edges
Inscribed polygon, since it is inside the circle.
Depending on how you want to define vertices, a circle either has no vertices or the circle is composed of infinite vertices. A vertex is where two straight edges meet. Since a circle is continuously curved you can easily argue that it has no straight edges to meet and form a vertex. From a limits standpoint though it has infinitely many straight segments - but they are are all of length 1/∞