Any regular polygon with an odd number of sides.
- Triangle (3 sides at 60 degree angles)
- Pentagon (5 sides at 108 degree angles)
- Heptagon (7 sides at approximately 129 degree angles (3 s.f.))
- Nonagon (9 sides at 140 degree angles)
- Undecagon (11 sides at approximately 147 degree angels (3 s.f.))
and so on...
Also these quadrilaterals
- Kite (two pairs of equal side length, opposite angles equal)
- Arrow-head (two pairs of equal side length, one pair of equal angles)
Also, irregular shapes may have no perpendicular or parallel lines.
See related links for quadrilateral pictures.
a shape with no faces or lines.
