The 2D equivalent of a sphere is a circle so it follows that the 2D equivalent of a hemisphere is a semicircle.
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A semi-circle.
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
A 2D shape with forty sides is known as a tentracontagon.