Because the prefix , hex- refers to six. A plane figure with 12 vertices is a dodecagon.
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In 2D, there are 6 vertices in a hexagon; there are 36 vertices in 6 hexagons. In 3D, it doubles up to 12 vertices.
A hexagon has 6 sides and 6 vertices.
If it is a an hexagonal prism then it will have 12 vertices
A hexagon based pyramid.