It is a 5 sided pentagon
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Pentagon
Pentagon , 5 sided shape with 5 vertices Hendecagon , 12 sides and 12 vertices
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).
A polygon with 5 sides/vertices is called a pentagon.
pentagon