There are regular polygons (with 3, 4 and 6 sides).There are irregular convex polygons (with 3, 4, 5 or 6 sides). There are [irregular] concave polygons with various numbers of sides.
Hexagons
Regular polygons with 3, 4 or 6 sides.
For regular polygons: 3, 4, or 6. For irregular polygons, figures with any number of sides can be found.
Regular polygons with even sides if there are 6 or more of them; selected irregular polygons with seven or more odd numbers of sides.
There are regular polygons (with 3, 4 and 6 sides).There are irregular convex polygons (with 3, 4, 5 or 6 sides). There are [irregular] concave polygons with various numbers of sides.
quadrilaterals only have for sides and polygons have 5-6
Hexagons
Regular polygons with 3, 4 or 6 sides.
For regular polygons: 3, 4, or 6. For irregular polygons, figures with any number of sides can be found.
Regular polygons with even sides if there are 6 or more of them; selected irregular polygons with seven or more odd numbers of sides.
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
The hexagon is the only one that has exactly 6.All polygons with 6 or more sides have at least 6 interior angles.
Infinitely many. Polygons with 6 or more sides can have 3 pairs of parallel lines. Polygons with 7 or more sides can have a set of three parallel lines.
Yes
A parallelogram and selected polygons with 6 or more sides.
A parallelogram or a selection of polygons with 6 or more sides.