All regular polygons do.
yes
There would be too many to name. All regular polygons have a line of symmetry, but there are still polygons that don't.
almost all even number of sided polygons, regular has to be
Well, they all have 360 degree rotational symmetry :P Sorry, not helpful.I think these all do: H, I, K(depending on how you write it), N, O, S, X, ZH, I, O, and X have rotational and reflectional symmetry, and N, S, and X also have rotational.
All regular polygons do.
no
All of them have rotational symmetry because all the sides and angles have to be the same in order for the polygon to be a regular polygon
yes
An equilateral triangle, and all regular polygons with 3n sides.
true
false
There would be too many to name. All regular polygons have a line of symmetry, but there are still polygons that don't.
almost all even number of sided polygons, regular has to be
if all of the side are equal to each other, then it will have rotational symmetry. this means that if you stick a line through it and goes through the center, then it is a line of symmetry. the answer is infinity.
A circle (infinitely many lines of symmetry), ellipse, rectangle, and all regular polygons.
I, H, N, O, S, X & Z all have rotational symmetry.