The number of lines of symmetry in a polygon corresponds to the number of sides it has. If a polygon has n sides, then its symmetry will be n lines of symmetry and it will have one point of symmetry. A pentagon has five lines of symmetry, nonagon has 9, n-gon has n lines of symmetry, so on and so forth.
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It has one line of vertical symmetry
An isosceles triangle for example has only one line of symmetry
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Only One Line of SymmetryAn isosceles triangle only has one line of symmetry.