There is no such thing.
An axis (plural = axes) of symmetry (not symmerty) for any plane figure is a line which divides the figure into two shapes that are mirror images of one another.
180 degrees
4
1
Three
Order 4.
Yes
It would help if you checked your spelling before posting the question. I can guess that "symmerty" is meant to be symmetry but I have no idea what a hepaton is. Sorry.
one
Yes, of order 2.
A Heart or a Triangle.
P, g and elephants
Yes