it is a 3d shape because it is not flat
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The 2D equivalent of a sphere is a circle so it follows that the 2D equivalent of a hemisphere is a semicircle.
A sphere is three-dimensional. It has height, width and depth.
An Oblate Sheriod is indeed a 3D figure. Coming From the root SPHERE.
a circle can do neither, if you mean a sphere then I must inform you to remember that a circle is 2D and a sphere is 3D..... So spheres can't do either, they often get tired and goto sleep.
A 3D system is a system which has all the three dimensions of geometry, namely- length, width and depth. eg. A sphere, a rectangle, etc. A 2D system is a system which has only two dimensions and can be generated on a plane. eg.- a square, a triangle, a circle, etc.