with corners: rectangles and rhombi
without corners: ovals (ellipse)
The diagonals are the two lines of symmetry of any rhombus that is not a square.
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A four-sided quadrilateral having two lines of symmetry is a rectangle
Technically, a square is a rectangle with four lines of symmetry. A non-square rectangle has exactly two lines of symmetry: the vertical and the horizontal.
No. A pentagon can have 1 or 5 lines of symmetry.
Yes. An ellipse (oval) has two lines of symmetry, but not a rotational symmetry. A parabola has one line and no rotation.
Ellipses and non-square rectangles have two lines of symmetry.