A dodecahedron can have 8 to 20 vertices.
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A dodecahedron has 12 sides.
a dodecahedron has 20 vertices and 12 faces
A dodecahedron is a generic term which describes a 3-dimensional shape with 12 polygonal faces. There are approx 6.4 million topologically different convex dodecahedra plus concave ones. They can have 8 to 20 vertices and 18 to 30 edges.
If one of its exterior angles is 30 degrees, then it is a star with 6 points and 12 sides. 360 degrees / 30 degrees = 12 angles It is a regular dodecahedron.
A dodecahedron need not have any parallel lines.