It has 4 side and 4 vertexes
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A polygon has the same amount of vertices as it does sides, so it would have 7 vertices.
A 20-sided polygon is called an icosagon. In geometry, a polygon with n sides has n vertices. Therefore, a 20-sided polygon would have 20 vertices. Each vertex represents a point where two sides of the polygon intersect.
describe the character;information of polygons
A shape with four sides and three vertices does not exist in Euclidean geometry. In Euclidean geometry, a shape must have the same number of sides as vertices. Therefore, a shape with four sides would have four vertices.
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.