10
A decagon is a plane (2-d) figure and so it has only one face. It has 10 sides and 10 vertices.
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10 faces 10 faces
1 face 10 edges
Oh, dude, a decagon has 10 sides, so it also has 10 vertices. As for faces, well, a decagon is a 2D shape, so it technically only has one face. But hey, who's counting, right?
It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
A decagon has ten vertices.