They have 6
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how many vertices does 3 hexagons and 8 rectangles have all together
In 2D, there are 6 vertices in a hexagon; there are 36 vertices in 6 hexagons. In 3D, it doubles up to 12 vertices.
An octahedron shape is one which has 8 faces. Since it is a prism it must be a hexagonal prism (2 hexagons and 6 rectangles = 8 faces). And a hexagonal prism has 2*6 = 12 vertices.
A hexahedron is a three-dimensional figure with six identical faces - in other words, a cube. So a hexahedron is not made up of hexagons at all, but of squares. However, if you were to balance a cube on one of the vertices, the horizontal plane cutting the cube in half would make a cut in the shape of a regular hexagon. Four such regular hexagons can be found in the cube.
there is 7 hexagons in the design