Pi has 2 lines of symmetry
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There are no lines of symmetry; However, the lines opposite are parallel to each other
3 Lines of symmetry
It has 3 lines of symmetry which are the perpendiculars taken from each vertex to the opposite base
It depends on the nature of the irregularities. If you have an octagon where each alternate side is equal then you can have 8 lines of symmetry.
The diagonals of rectangles are rotational lines of symmetry but not reflective. To be reflective lines, folding along the line has to give the same shape on each side.