4*pi*r2. because surface area is equal to circumference of circle.
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C = 2(pi) r circumference of a sphere = 2*pi*radius or pi*diameter (Any circular circumference is the same for a perfect sphere.)
The circumference of a circle divided by its diameter is the value of pi and pi has a wide range of uses some of which are:- Finding the volume of a sphere Finding the surface area of a sphere Finding the volume of a cone Finding the volume of a cylinder Finding the area of a circle Finding the circumference of a circle
Circumference of a circle = (pi) x (diameter)
Volume of a sphere = 4/3*pi*radius3 and measured in cubic units
If you mean 4*pi*r^2 then it is the formula for finding the surface area of a sphere