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4/3π r³ =81π /:π
4/3r³ =81 / ·3/4
r³ = 243/4
r=∛243/4= ∛243/∛4= ∛27∛·9/ ∛4 ·∛2/∛2= 3∛18/2
P= 4πr²
P= 4π ·(3∛18/2)²=4π·(9·∛324/4)= 4 się skracają
= π·9·∛27·∛12= 27π∛12
P= 27π∛12