Answer: 3
Equilateral triangles, squares and regular hexagons are the only regular polygons that tessellate.
Explanation:
In mathematics, a tessellation is the covering of the plane by closed geometric shapes, called tiles, without gaps or overlaps. Regular polygons have congruent straight sides. When we slide or rotate a regular polygon, the side of the original figure and the side of its translation will match.
Equilateral triangles, squares and regular hexagons are the only regular polygons that tessellate. Therefore, there are only three regular tessellations.