Surface area of a sphere = 4*pi*radius2
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The surface area of a polyhedron can be calculated by first calculating the area of each of its polygonal surfaces and adding these together.The surface area of some curved solids (sphere, cylinder, cone) can be calculated from formula but for most curved solids are more complicated and require integration.
Surface area of a sphere = 4*pi*radius squared
2(pi)(r)(h)=the area of the curved surface
Surface area = 4*Pi*radius2
Surface area of a sphere = 4*pi*radius2 Surface area = 4*pi*42 => 201.0619298 Surface area of the sphere = 201 square units correct to three significant figures.