Use the equation r = d - 1 to find the value of r when d = 3.
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To solve this, we are going to use the surface are of a sphere formula: 
where
is the surface area of the sphere
is the radius of the sphere
We know for our problem that
and 
, so lets replace those vales in our formula:
Now, we just need to solve our equation for:
or
Since the radius of a sphere cannot be a negative number,.
We can conclude that the radius of a sphere with surface area <span>2,122.64 </span>
is 13 in.
where
We know for our problem that
Now, we just need to solve our equation for
Since the radius of a sphere cannot be a negative number,
We can conclude that the radius of a sphere with surface area <span>2,122.64 </span>