A 3-dimensional object is ANYTHING with length AND width AND height.
a tree
a house
a chair
a person
a book
a box
an ice cube
a hill of snow
cube
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A two dimensional object has a length and a width. In comparison, a three dimensional object has a length, a width, and a height.A square and a circle are two examples of two dimensional objects. When you draw them on paper, you are only drawing them in two dimensions. They do not come out of the paper, as they have no height.If they did have height, they would be three dimensional and would respectively be called a cube and a cylinder.
Examples of 3 dimensional structure are a pyramid, a cone, a cylinder, a prism, a cuboid ... etc
They are both 3 dimensional objects
There are none.A square is a 2-dimensional object and so there cannot be any 3-dimensional objects in it.
They are all curved 3 dimensional objects.