Half a sphere is called a hemisphere. For instance, half of the earth is divided into the southern or northern hemisphere. The full sphere may be divided by a plane.
2 Additional Answers
The term that is used to name half of a sphere is the hemisphere. The term may also refer to half of the earth, that is divided by the equator into the northern and southern hemispheres.
Half a sphere is called a hemisphere. It is as a result of division of a sphere by a plane line through the centre. If two planes pass through the centre, they then form four biangles or lunes in the process. A hemisphere is normally conjectured to be the least area of the Riemannian circle.