Betsy wants to paint the walls of a square closet. Her closet walls measure 10 feet long and 8 feet high. Each wall is the same
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The surface area of a sphere is 
where r is the radius;
The circumference is
so that 
using this value we can evaluate the surface area of 1 ball as:
For 100 ball you get:
The circumference is
For 100 ball you get: