Not a regular nonagon.
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A nine sided polygon does not normally tessellate
No because its interior angle of 140 degrees is not a factor of 360 degrees.
Yes a quadrilateral will tessellate.
No, but an octagon and a square can tessellate.
All triangles will tessellate. All quadrilaterals will tessellate There are 15 classes of convex pentagons (the latest discovered in 2015) which will tessellate. Regular hexagons will tessellate. In addition, there are 3 classes of irregular convex hexagons which will tessellate. No convex polygon with 7 or more sides will tessellate.