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Humans eyes are a little distance from one another and so they see slightly different images. These two images are reconstructed by the brain so that things look three dimensional. 3D films such as Avatar have two images on the screen and the colours are such that one image is seen by one eye through the special glasses and the other by the other eye. Each image is just slightly different to the other and the effect on the human is a 3D image.
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How does a 3D object differ from a 2D object?
Well, a 2D object has only length and width, but a 3D object has length, width, and depth.
What is the 5th dimension?
To explain multidimensional concepts is difficult. First a shadow is a two dimensional representation of a three dimensional object. You have to turn the object to see more than one side of the 3D object. A 3D object is a representation of a 4th dimensional object and a 4th dimensional objects represents the 5th dimension. To see pictures represented graphically a computer can help. If we research polytopes it will give examples.
Is a piece of paper a 2D shape or a 3D shape?
Paper is a 3D object.
Which 3D object has no vertices?
A sphere.
What 3d object has 7 faces?
A Heptagon is a 3d object with 7 faces. An example of a heptagon is a hexagonal pyramid (that is a pyramid with a hexagon for the base).
