No.
No.
No, you cannot.
Yes, a regular hexagon does tessellate.
No
Yes. Can it tesselate R^3? Only if its base pentagon is non-regular.
Triangle, square, hexagon.
A regular heptagon has seven sides.
900 degrees, and the heptagon does not need to be regular.
A regular heptagon has no parallel sides.
heptagon
True * * * * * No. The only regular polygons that will tessellate are a triangle, a square and a heagon. So a regular heptagon will not tessellate.