Many things are hexagonal. A pencil and honeycomb are good visual examples.
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A concave hexagon or a concave octagon.
An Irregular hexagon looks like anything that has no bended angles/sides. Also it only has 6 sides/angles.
the hexagon divided into three rhombi looks like a box
It is a shape with six straight sides (and six vertices). That is all. So it could look like: |\..../| |..\/..| |......| |../\.| |/...\| Of course, it need not be symmetrical.
It looks like four equilateral triangles that have been put together so that one vertex of each meet at a point.