An octagon has 20 diagonals
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A polygon with 20 sides is an icosagon.
A 20 sided polygon is an 'icosagon'
A 20 sided polygon
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.
It has 360/20 = 18 sides