All forms of matter have a three dimensional shape on a molecular level.
Nothing except for images exist in only two dimensions and even than the medium they are displayed on or with does itself exist in three dimensions even if one of those dimensions is amazingly short in relative terms to the others. (even a piece of paper has thickness regardless of how flat the image portrayed on it appears)
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Well, isn't that just a happy little question! You see, to create a three-dimensional shape from a two-dimensional material, all you need is a little imagination and some creativity. By folding, cutting, or manipulating the material in different ways, you can give it depth and form, turning a flat surface into a beautiful, three-dimensional masterpiece. Just remember, there are no mistakes, only happy accidents!
a triangle * * * * * Wrong on at least two counts: A triangle need not be irregular and a triangle is not a three dimensional shape. Any pyramid other than a regular triangular pyramid (tetrahedron), any prism other than a cube are some examples.
The answer depends on the shape. If the 4-Dimensional shape is analogous to a 3-D shape then the formula will be analogous. If not, then you may need to find the formula for the shape in 4-D space ant integrate.
No they cannot. For example, in three dimensions, the angles of a triangle need not add to 180 degrees.
It is a plane figure. It need no have any specific shape with a name.