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A hemisphere is a 3-d shape and so does not have a name as a 2-d shape. 2-d sections of a hemisphere can be circles, semicircles, or sections of circles, depending on the inclination of the intersecting plane.
No, it is a 3-d shape. A circle is a 2-d shape.
Hemisphere.
A hemisphere, a cone.
A 2-d shape. The suffix -gon indicates a 2-d shape while -hedron indicates a 3-d shape.