a sphere
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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.
One face, the same as a circle. For both a 2D and a 3D oval it's the same. 3D ovals and circles have no vertices or edges. 2D ovals and circles have one edge.
Close - they're called concentric circles.
3D means that they have three dimensions, which are height, width and depth. 3D figures are solid shapes such as cubes and spheres, rather than their 2D equivalents which would be squares and circles.
circle based rectangle