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A pentagon has five lines of symmetry. It also has five internal angles.

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A square.

Also some irregular polygons with 8, 12, 16 etc sides.

A regular nonagon.

An irregular polygon with 9k sides where every kth side and angle are the same.

An equilateral triangle.

A square

Q: What shape has a diagonal line of symmetry?

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If you had a circle and you halved it, exactly in the middle, then that line would be a line of symmetry! And it is the same with a square. If you halve it exactly in the middle then that would be called a line of symmetry! And then all the lines of symmetry in a square are down, across, diagonal from the left and then diagonal from the right! But in a circle there are LOTS of lines of symmetry!

It has a line of rotational symmetry - along the diagonal.

Axis of symmetry.

effectively yes. Diagonal symmetry is when the line of symmetry goes diagonally, rather than horizontally or vertically

yes

No.

yes

Yes * * * * * Not generally.

Only a line can be diagonal, not a shape

no.

If you draw a diagonal line from corner to corner of a parallelogram, that is a line of symmetry.

A symmetrical shape is said to have line symmetry. A shape that has line symmetry can have one or more lines of symmetry