10 lines of symmetry
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.
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 regular decagon has 10 lines of symmetry. Each line of symmetry can be drawn through a vertex and the midpoint of the opposite side, as well as through the midpoints of two opposite sides. This symmetry reflects the decagon's equal angles and sides, allowing for multiple symmetrical divisions.
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.)