There are many shapes: circles, ellipses, ovals (elongated circles), cardioids, any shape with a "hole" in it such as a annulus.
Polygons will tessellate if combined with other suitable polygons.
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crosses and hexigon
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Wrong: both, crosses and hexagons WILL tessellate. However any polygon with 7 or more sides will not tessellate.
No not all shapes tessellate.
For any polygon, there will be other shapes such that, together, they can tessellate.
I believe that regular shapes will only tessellate if the sum of their internal angles is a multiple of 180.
Shapes tessellate to fit around an interior angle. They also tessellate because they are regular polygons; non-regular polygons cannot tessellate. * * * * * Not correct. All triangles and quadrilaterals will tessellate, whether regular or irregular. Contrary to the above answer, a regular pentagon will not tessellate but there are 14 different irregular pentagons which will tessellate (the last was discovered in 2015). Three convex hexagons will do so as well. No polygon of 7 or more sides will tessellate - whether they are regular (contrary to the above answer) or irregular.
An octagon cannot tessellate because when you put about 4 together, there are gaps in between the shapes, which is not allowed in a tessellation. When you put together 5 octagon's, some of them are overlapping and there still are gaps. Therefore, an octagon cant tessellate.