Q: How do you count the lines of symmetry?

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No because diagonal lines do not count. Even though they might fit perfectly inside the rectangle, but those don't count. Only lines going horizontally or vertically count as lines 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

A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.

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There are 6 lines of symmetry if you count sides and not just vertices. (=

No because diagonal lines do not count. Even though they might fit perfectly inside the rectangle, but those don't count. Only lines going horizontally or vertically count as lines of symmetry. :)

2 lines of symmetry

nobody knows look at it and count jp jp

A nephroid has 2 lines of symmetry.

it has five lines of symmetry

Equilateral Triangles (3 lines of symmetry)Rectangles (at least 2 lines of symmetry)Squares (4 lines of symmetry)Rhombuses (at least 2 lines of symmetry)Any regular polygon (at least 5 lines of symmetry)

it has no 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

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

A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.

5 lines