No, a hexagon is not a tessellation. Some hexagons can tessellate a plane, others will not.
no
A regular hexagon cannot make a 3d figure because a regular hexagon tessellates. As a result t will make a large tiled surface. If the hexagon is not regular then the side elevation will depend on the shape of the hexagons and how they are configured.
No, it will not tessellate.
yes
It's one of the only shapes which tessellates perfectly (think tiles, if you tiled a wall with hexagons then there wouldn't be any gaps. Of the shapes which tessellate perfectly (triangle, square, hexagon) it has the smallest perimeter for its area i.e. a square of area 10cm^2 has a greater perimeter than that of a hexagon with an area of 10cm^2. So, if you were a bee trying to make a honeycomb then the hexagon is best because it would use least wax to make a certain area of comb (because of the perimeter/area ratio) and also not waste any space (because it tessellates without leaving any gaps). Hope that helps.
Not everything tessellates
Yes, squares can tessellate.
A rhombus tessellates.
Triangles, Squares and Hexagons always tessellate.
6 sides, 6 Vertices, 6 Axis of Symmetry; Tessellates (you can place hexagons side-by-side and they meet with no gaps), {like Tiles}; The sum of the internal angles is 720º, All sides equal length, The longest diagonals (from on vertex to the opposite one) are equal to twice the length of the sides.
No. An equilateral polygon with 5 or with 7 or more sides will not tessellate a plane.
When referring to it as a hexagon is not a faux pas.