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A television set is a 3D shape. The image (picture) on the television screen is a 2D shape. 3D is when it has length, width, and height. 2D is only length and width.
TV sets are rectangular, not square, because rectangular shape is the most suitable one to better be viewed by the TV watcher. Rounded shape is used only for gyratory elements, watches, lens, etc.
A ball, a cone, a cereal box are examples of 3d shapes. Basically it is anything that you can physically touch, like your tv, computer, car etc. They are called 3d because they have 3 planes (you can measure its length, with, and volume). Things that are not 3-dimensional would be things that you would see in a book, or on television. They would be 1 dimensional because you cannot measure its volume.
The importance of polygons would probably relate to the variety of polygon shapes often used in the building of modern structures. The triangle, for instance, is often used in construction because its shape makes it comparatively strong. The use of the polygon shape reduces the quantity of materials needed to make a structure, so essentially reduces costs and maximizes profits in a business environment. Another polygon is the rectangle. The rectangle is used in a number of applications, due to the fact our field of vision broadly consists of a rectangle shape. For instance, most televisions are rectangles to allow for easy and comfortable viewing. The same can be said for photo frames and mobile phones screens.
A static shape is a shape that is stable and still. It is the opposite of a dynamic shape which is an active shape that is moving.