Considering it mathematically string is nothing but a line... So it only has one dimension that is length..
considering it physically.. It is nothing but a metal ROD.. with a given Diameter so it has three degrees of freedom hence it is a 3D structure..
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Area is a two-dimensional measurement. It tells you how big a two dimensional object is or how large the surface of a three-dimensional object is.Volume is a three dimensional measurement. It tells you how big the inside of a three-dimensional object is or how much a three-dimensional object can hold inside.
A polyhedron is a three-dimensional object, not two-dimensional.
That's more of a statement than a question. It's also a false statement. You can build a three dimensional object from two dimensional objects, if you have an infinite number of them.
A cube is specifically a three-dimensional object in geometry and therefore cannot be two-dimensional.
Clouds are three dimensional, which is very noticeable if you have ever flown through one in a plane (as I have). I would also note that all physical objects are three dimensional; a true two dimensional object only exists as a mathematical abstraction. However, some things come close to being two dimensional. A piece of paper does have some thickness, but for most purposes it can be treated as a two dimensional object.