A circle, since it has an infinite number of lines of symmetry
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Octagon
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.
As a 2D polygon shape it is an 8 sided octagon.
Yes a triangle is a 2D polygon shape
Such a 2D shape is a hexagon, a six sided figure.