"All of the polyiamonds of order eight or less, with the exception of one of the heptiamonds will tessellate the plane. The exception is the V-shaped heptiamond."
Source: http://www.mathpuzzle.com/Tessel.htm
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No not all shapes tessellate.
they all tessellate because they all fit together
Some can, but not all. For example, rhombi, rhomboids, oblongs, and isosceles triangles can tessellate; however, most irregular polygons cannot. * * * * * True, but an incomplete answer. All triangles and quadrilaterals, whether regular or irregular, will tessellate. No regular pentagon will tessellate but (as of 2016), there are 15 irregular pentagons which will tessellate. There are 3 convex hexagons, (regular and 2 irregular) which will tessellate. No polygon with 7 or more sides, even if it is regular, will tessellate.
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.
In geometry, when quadrilaterals tessellate, they fill a finite or infinite space with no overlaps or gaps between shapes. All quadrilaterals tessellate because they can all be linked together side by side in some shape or form with no overlaps. In geometry, when quadrilaterals tessellate, they fill a finite or infinite space with no overlaps or gaps between shapes. All quadrilaterals tessellate because they can all be linked together side by side in some shape or form with no overlaps.