Very close to 11, if not exactly 11.
It has 14 sides! The regular polygon with 14 sides is called a tetradecagon.
65
None.
A decagon is a 10 sided polygon
If you say this shape is 18 sided i would guess it has 18 sides. ;)
5 pairs of parallel sides.
A regular decagon, or 10-sided polygon, has interior angles of 144
It is a six sided regular hexagon.
360 ÷ 72 = 5, so that the regular polygon is a pentagon (a five-sided polygon).
10 lines. Regular polygon of "x" sides has "x" Lines of Symmetry
A regular nonagram has nine sides. It is a nine-sided polygon, also known as a nonagon. In a regular nonagram, all sides and angles are equal.
A 40-sided polygon has 40 sides. Count again, to be sure.