Q: How many lines of symmetry on a decagon?

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decagon

A regular decagon would have five sets or parallel lines.

2 lines of symmetry

10

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

Related questions

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

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

A dodecagon need not have any lines of symmetry. It can have a maximum of 12.

10

Ten.

7

6

decagon

None are guaranteed.If it is a regular decagon (convex, with all side lengths equal and all angle measures equal), then there are 10 lines of symmetry.

A decagon and any polygon above a pentagon has more than two lines of symmetry

A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)

There need not be any.