A parallelogram need have no lines of symmetry.
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A parallelogram has no lines of symmetry. This is true as the lines of symmetry of a parallelogram must either be a diagonal of the parallelogram or must be bisectors of opposite sides. There is no way to draw such lines through a general parallelogram and have it produce mirror images on either side of the line. Thus, it has no lines of symmetry.
A nephroid has 2 lines of symmetry.
It has 2 lines of symmetry.
no lines of symmetry
5 lines
A hectagon has 9 lines of symmetry!