Final answer:
Regular nonagons do not tessellate a plane due to the restrictions of regular tessellations with equilateral triangles, squares, and hexagons.
Explanation:
Regular nonagons (9-sided polygons) do not tessellate a plane. Tessellation is the covering of a plane without gaps or overlaps using congruent figures. The only regular tessellations possible are with equilateral triangles, squares, and hexagons.
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