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Assuming that each vertex is used to connect exactly two sides, all two-dimensional shapes will have the same number of sides as vertices. So a shape with 4 sides will have 4 vertices and a shape with 3 sides will have 3 vertices. Think of a square (4 sides, 4 vertices) and a triangle (3 sides, 3 vertices).
It is a quadrilateral that has 4 sides and 4 vertices
A polygon with 9 vertices and 9 sides is a nonagon.
2-dimensional shapes, with three straight sides have three vertices.
Pentagon , 5 sided shape with 5 vertices Hendecagon , 12 sides and 12 vertices