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It depends on how many sides that it has and whether of not it is regular (all the lines of the polygon are of equal length if it is a regular polygon). For regular polygons, the number of symmetry lines is the number of sides if number of sides is an odd number. Otherwise, the number of symmetry lines is double the number of sides. A square has 4 sides and 8 symmetry lines; a triangle has 3 sides and 3 symmetry lines.

Q: How many lines of symmetry does a plolygon have?

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A nephroid has 2 lines of symmetry.

It has 2 lines of symmetry.

no lines of symmetry

5 lines

It has 7 lines of symmetry

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it has five lines of symmetry

A nephroid has 2 lines of symmetry.

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It has 2 lines of symmetry.

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There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.

There are infinitely many lines of symmetry. Every line can be a line of symmetry for a suitable shape.