Actually it has ten vertices's you half to count the inside too
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It has 10 vertices, 10 edges, and 0 faces.
An octagon has 8 sides and 8 vertices
The dodecahedron star has 30 edges, 12 faces, and 20 vertices. But, a 3D dodecagon star has 60 edges, 24 faces, and 40 vertices but i'm not sure. Some people still need help on how many edges faces and vertices a dodecagon star has. Thanks for your cooperation by looking at this answer.
it has 30 vertices
11 vertices