No vertices (0). a heart shape is not a polygon shape, only polygon shapes have vertices.
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A Square has 4 sides and 4 vertices.
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 star is not a specific shape: it is a generic word for a shape which has an even number of vertices. The interior angles at alternate vertices are usually reflex angles. A star can have six or more vertices.
A circle has no vertices and is round.