There need not be any.
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.
Ten.
6
A dodecagon need not have any lines of symmetry. It can have a maximum of 12.
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.
10 lines of symmetry
7
A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)
10
Ten.
6
A dodecagon need not have any lines of symmetry. It can have a maximum of 12.
A decagon has 10 sides, so it also has 10 angles. Each angle of a decagon is 36 degrees (360 degrees divided by 10). Therefore, a decagon has 10 angles of rotation 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.
10 axes of symmetry