For two dimensional shapes, a vertex (plural vertices) is a point where two sides meet.
For 3D shapes, a vertex is a point where three or more faces meet.
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A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
A circle has no vertices and is round.
No vertices (0). a heart shape is not a polygon shape, only polygon shapes have vertices.
There is no such shape.
A polygon with 9 vertices is a nonagon.