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 answer depends on the size of the sphere. When you've been around as long as we have, you start to notice that big spheres have more surface, and small ones have less surface. But whether the sphere is big or small, its surface in square feet is always 12.5664 times the square of its radius in feet.
Surface area of a sphere = 4*pi*radius2