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A convex hexadecagon has 8 diagonals.
Gamel Hexadecagon Barn was created in 1900.
A hexadecagon is a polygon (a flat figure made of straight lines) with 16 sides.
A hexadecagon is a polygon with 16 sides and 16 vertices.
McArthur-Martin Hexadecagon Barn was created in 1883.