At the risk of being tautological, the answer is SPHERICAL.
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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.
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
Surface area of a sphere = 4*pi*radius2
The surface area of a sphere with a radius of 2 is about 50.27 units2