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Ten. The prefix "deca-" means ten.
A decagon is a shape that has ten sides. As long as the figure has ten sides to it, then it is a decagon.
The shape that has ten sides and ten vertices is a decagon.Dec-a-gon
The word, "Decagon" must have ten sides. Its beginning, "Deca", is Latin for ten.
A shape with ten sides and seven vertex is impossible. There must always be the same amount of sides as vertex in a shape.