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Half a sphere is a hemisphere or the shape of a ball cut in half.
There is NO equation for the area of a sphere Assuming you mean surface area, the surface area of a sphere of radius r is 4πr^2.
Literally they both mean ball (orb from Latin, sphere from Greek).
A sphere is a geometrical globular shape which has a volume of 4/3*pi*radius3 and a surface area of 4*pi*radius2
i do not know iam in fith grade how about you?