A circle is by definition a 2-dimensional object. It doesn't exist in the third dimension so I suppose you could call a 3d circle an impossibility?
It's a hemisphere.
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A 3D semi circle
If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
yes it can, i have a uplight that is semi circuluar it is 3d
Half a sphere, which is a 3D shape, is called a hemisphere. The semi-circles in the question is a 2D shape and will make a circle.
Semi = half