Five. One line going from each of the corners, through the centre and through the mid point of the opposite side. Assuming it is a regular pentagon where all sides and angles are equal.
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5 lines
A pentagon can be symmetric, yes. It is symmetric around any of its lines of symmetry. Yes, divide it starting from the top down 2 the bottom. Pretty simple.
A nephroid has 2 lines of symmetry.
It has 2 lines of symmetry.
no lines of symmetry