Order 4.
zero
A square is on example. The perpendicular bisectors of the sides and the two diagonals comprie four lines of symmetry.
Square, circle, rectangle, octagon, pentagon, triangle, hexagon, trapezoid, rhombus. These are just some
A Heart or a Triangle.
one
4
zero
A square is on example. The perpendicular bisectors of the sides and the two diagonals comprie four lines of symmetry.
180 degrees
Square, circle, rectangle, octagon, pentagon, triangle, hexagon, trapezoid, rhombus. These are just some
1
Three
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.