It is the set of all points [from some fixed point] at a distance of 1 unit, where the points on the surface of the sphere are included in the set.
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unit in earth science used for measuring angles in a circle or sphere?
No, a sphere is like a circle. A circle is a closed figure that is not a polygon. Also another definition it is a shape with all points the same distance from the origin (center). Remember if it had any edges you would have seen the they are sharp looking rectangles and other polygons have edges.
By applying the process of triple integration (calculus) to the definition of a sphere.
By definition a sphere is 3D. If it were only 2D it would be a circle.
1 kg is not a volume. It's a 'mass'.If the volume of a sphere is 1 cubic unit, then its diameter is 1.2407 unit (rounded).