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πr² = 9π
r²=9
r=3
pole kuli P=4πr² = 4π3²=36π
V=(4/3)πr³ = (4/3)π3³=(4/3)×27×π=36π
B) obliczam r
(4/3)πr³ = π/6 π-się skraca
(4/3)r³=1/6
r³=3/24=1/8
r=1/2 dm
P=4πr² = 4π(0,5)²=4π×0,25=π dm²