Hexagonal prism because it has six rectangular faces (one that connects each edge of the two hexagon faces) and 18 edges. 12 are for the two hexagon faces, and the other 6 are for the rectangular faces.
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It is a Hexagonal Prism.
[tex]\rm{Number\ of\ edges = 3\times\ Number\ of\ sides\ of\ the\ base}[/tex]
[tex]\rm{18 = 3\times\ Number\ of\ sides\ of\ the\ base[/tex]
[tex]\rm{Number\ of\ sides\ of\ the\ base = \dfrac{18}{3}[/tex]
Number of sides of the base = 6,
Thus, it is a Hexagonal prism.
Also, in a hexagonal prism, as we can see in the image below, the 6 rectangles are joined together while the two bases cover up the hollow sides of the figure which are in a hexagonal shape.
Hence, it is a Hexagonal Prism.
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