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A regularpentagon has 5 lines of symmetryAny pentagon could have less and so can have up to 5 lines of symmetry.
A right angle has one line of symmetry.
2 lines of symmetry
A nephroid has 2 lines of symmetry.
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