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V=π/ 6 dm³
V=4/3πr³
4/3πr³=π/ 6 dm³ *6
8πr³=π /:π
8r³=1
r³=1/8
r=1/2 dm
P=4πr²
P=4π(1/2)²
P=4π(1/4)
P=π dm²
4/3πR³ = π/6 |*6
8πR³ = π |:π
8R³ = 1 |:8
R³ = 1/8
R = ∛1/8
R = 1/2
Pp = 4πR²
Pp = 4π*1/2*1/2
Pp = 4π*1/4
Pp = 1π
Pp = π [dm²]