Yes It Does
yes
All regular polygons do.
almost all even number of sided polygons, regular has to be
There would be too many to name. All regular polygons have a line of symmetry, but there are still polygons that don't.
Regular polygons.
A circle (infinitely many lines of symmetry), ellipse, rectangle, and all regular polygons.
no
yes
yes
All regular ones do.
Yes.
No, it's not true that only regular polygons with an even number of sides are symmetrical. Regular polygons, regardless of whether they have an even or odd number of sides, are symmetrical. They possess rotational symmetry and reflectional symmetry; for example, a regular triangle (3 sides) and a regular pentagon (5 sides) both exhibit symmetry.