The area of a sphere with radius 'R' is [ 4 pi R2 ].
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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.
Area of a sphere = 4(pi)r2
Surface area of a sphere = 4πr2
Take the surface area of the sphere as of it was whole, and divide by the amount of the sphere that is missing.
Surface area of sphere is : A= 4*pie*r^2