An ellipse has two lines of mirror symmetry: the line that includes the two foci of the ellipse and the perpendicular bisector of the segment of that line between the two foci.
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None; an ellipse is a smooth curve, not a line.
it has 4 lines of symmetry
a scalene triangle has no lines of symmetry
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A regular Undegon (11 sided polygon) has 11 lines of symmetry. It also has an order of rotation symmetry of 11.