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All regular shapes have a line of symmetry. But you can get rid of its line of symmetry by making it irregular (so the angles aren't the same).
This depends on the type of prism. If the shapes on the ends are pentagons, the prism has 6 planes of symmetry. If they are hexagons, it has 13 planes of symmetry. It has the same number of planes of symmetry as the shapes on the end have lines of symmetry, plus 1.
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How many lines of symmetry does an equilateral triangle have?
Some shapes do not have any lines of symmetry. These shapes are called asymmetrical. It doesn't matter how you fold an asymmetrical shape--the two halves just won't match!