A pentagon
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A pentagon must be a closed polygon with five straight sides and five vertices.
The formula is: number of sides = number of vertices = 5.
A pentagon has 5 vertices. The name penta from the greek word for five designates this as a polygon with 5 sides.
An octagon has eight sides and eight vertices. An octagon has 8 sides and 8 vertices.
Yes, they can have sides and vertices.