nothing actually
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A decagon and any polygon above a pentagon has more than two lines of symmetry
They both have the same amount of lines of symmetry. * * * * * Not true. A square has four lines of symmetry, a rectangle only two.
Yes. A circle has infinitely many lines of symmetry and it also has rotational symmetry of infinite order.
In this font it has two lines of symmetry.
There are no lines of symmetry.
A nephroid has 2 lines of symmetry.
a square has more then three lines of symmetry, but I don't think a parrellelogram with only two parallel sides can
Ellipses and non-square rectangles have two lines of symmetry.
No.
A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry
Squares, which are parallelograms, have four lines of symmetry. Rectangles have only two. Rhombi have two lines of symmetry. Generic parallelograms don't have any lines of symmetry.None normally unless it is in the shape of a rectangle in which case it will have 2 lines of symmetry