A sphere has a single curved surface. It is said to have one surface. Further, the sphere has no "flat spots" or "angles" or "discontinuities" of any kind. It is a planar figure that is the set of all points equidistant from a single point, which is its center.
A sphere has only one surface.
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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
The surface area of a sphere with a radius of 2 is about 50.27 units2
This sphere's surface area is 201.06 mm2