They are nonagons
Nonagons.
No because all 4 sided shapes are quadrilaterals which includes parallelograms
No because all 4 sided shapes are called quadrilaterals which includes parallelograms
All 4 sided shapes are quadrilaterals
If it's a regular 9 sided nonagon then each interior angle is 140 degrees and they all add up to 1260 degrees
Polygons.
no
Yes all 4 sided quadrilaterals will tessellate
No but they are all quadrilaterals
Quadrilateral.
They are endecagons (or hendecagons).
Hexadecagon.