Sphere Surface AreaFor Finding Surface Area of a SphereResult:314.159


radius (r)  units  

decimals  
A sphere with a radius of 5 units has a surface area of 314.159 square units.
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Surface Area (denoted 'SA') of a sphere with a known radius (denoted 'r') can be calculated using the formula below:
SA = 4(PI*r^{2})
In plain english the surface area of a sphere can be calculated by squaring the radius, multiplying the result by PI, and finally multiplying by 4.
You can approximated PI using: 3.14159. If the number you are given for the radius does not have a lot of digits you may use a shorter approximation. If the radius you are given has a lot of digits then you may need to use a longer approximation.
Here is a stepbystep case that illustrates how to find the surface area of a sphere with a radius of 5 meters. We'll use 3.14 to approximate PI because the radius we're given only has one digit.