All triangles have 3 sides and 3 vertices
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A polygon with three vertices and three sides is a triangle. A polygon with four vertices and four sides is a quadrilateral.
It is a triangle.
A polygon can have three or more edges and exactly the same number of vertices. All polygons have one face.
A common polygon with five vertices is the pentagon. A common three dimensional shape with five vertices is the square pyramid.
Twelve. The number of sides and vertices in a polygon are always the same.