Definition of hemisphere in maths
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In geometry it is an exact half of a sphere. It also refers to half of the Earth, such as the "Northern Hemisphere" (that part of the Earth north of the equator), or "WesternHemisphere" (the half of the Earth west of a line running from the North Pole through England to the South Pole, includes the Americas) Sphere.
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A half of the sphere is called hemisphere.
Formula :
Volume = 2/3 (πr3)
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