A Sphere is an the name for a shape of a 3D object that is like a ball or a globe.
If the shape is 2D then it is a circle
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It is a sphere
a cicel a or as known as a ball a ball is round
Example is a ball
'hemi' means 'half' and 'sphere' means 'round ball', so, a hemisphere would be a shape like half a coconut, eggshell, or anything else that is shaped like half a round ball. On a globe of earth, we have northern, southern, eastern and western hemispheres.
The soccer ball is round in three dimensions. It's a sphere. (The Laws of the Game actually specify a spherical ball.)