One half of a sphere.


Any plane that passes through the centre of a sphere divides the sphere into two hemispheres.


The formula to calculate the total area \(A\) of a hemisphere of radius \(r\) is:

\(A=\pi r^{2}+\frac{4\pi r^{2}}{2}=3\pi r^{2}\).

Geographic note

In geography, a hemisphere is one half of the Earth. The globe can be divided into two hemispheres, north and south, each of which is centred at a point called a pole and separated from the other by a great circle.

Similarly, the Earth can be divided into the Eastern Hemisphere and the Western Hemisphere, which are east and west of the Greenwich meridian.

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