A hemisphere
circle based rectangle
Klein Bottle: http://en.wikipedia.org/wiki/Klein_bottle Its circle
No 3D shape has only three sides to be a complete unit. If a 3D shape has a side which is curved, it has more than three sides, because any curve on a 3D object is an infinite number of sides. Think of it like if you had a million sided 2D object. From a distance, it would look like a circle, but mathematically, you can't have a perfect circle.
Spherical
Vicious Circle - 2011 3D Movies 2-1 was released on: USA: 9 June 2011
Sphere
the cone.
A line. Or a circle
a circle
A circle
There is no such thing as a 1 sided shape nor a two sided shape.
1 carbon and 4 hydrogen