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/∞
The shape that has no vertices and is round is a circle. The circle is the only shape that does not have vertices.
Zero vertices
None but it's possible to construct shapes within a circle that have vertices.
Inscribed
Circle or sphere.
The shape that has no vertices and is round is a circle. The circle is the only shape that does not have vertices.
A circle has no vertices and is round.
Zero vertices
A circle has no vertices around it
A circle has no vertices and it has one face. It could also be argued that a circle is the limiting form of a regular polygon with an infinite number of vertices.
A half circle does not have traditional sides or vertices like a polygon. It has a curved edge that forms the arc of the circle and a straight edge that serves as the diameter. Since vertices are defined as points where two sides meet, a half circle has no vertices.
None but it's possible to construct shapes within a circle that have vertices.
A polygon whose vertices are on a circle and whose other points are inside the circle is called a "cyclic polygon." The circle is known as the circumcircle of the polygon, and all the vertices lie on its circumference. In addition to the vertices, the polygon may have additional points that are located within the circle, but those points do not change the cyclic nature of the polygon. Examples include triangles, quadrilaterals, and other polygons as long as their vertices are on the circle.
Inscribed
A circle
Yes.
Circle or sphere.