Pentagon , 5 sided shape with 5 vertices Hendecagon , 12 sides and 12 vertices
The hendecagon is a polygon with eleven sides.
A hendecagon has 11 lines of symmetry.
9 (two less than the number of vertices in the polygon).
A hendecagon can have upto 5 pairs of parallel lines.
there are six
They have none
A right hendecagon can have no parallel sides because there are eleven sides to a hendecagon. It is not a requirement that there be any pairs of parallel sides in an irregular hendecagon, although there could be one or more pairs.
Every polygon has the same number of angles as it has sides.In the case of the hendecagon, that's eleven.