Circles are the most common. Any smooth curve has no vertices.
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Spheres are the only shapes that have no vertices. A sphere is a three-dimensional shape that is perfectly round, with all points on its surface equidistant from its center. Unlike other three-dimensional shapes such as cubes or pyramids, spheres do not have any corners or vertices where edges meet.
Vertices are the points where edges meet and form an angle.
A square or rectangle
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octagon
2 solid shapes together have 8 faces, 12 edges 8 vertices