A polygon with three vertices and three sides is a triangle.
A polygon with four vertices and four sides is a quadrilateral.
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It has 4 side and 4 vertexes
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.
All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.
A prism is a generic term. It describes a solid shape bounded by two congruent polygons (with n sides each), and n rectangles joining them together. The prism is names after the shape of the two polygons. A prism with an n-sided polygon as base has 2n vertices.
An octagon has eight sides and eight vertices. An octagon has 8 sides and 8 vertices.