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P=4πr²
400π=4πr²
r²=100
r=10
V=4/3πr³=4/3π10³= 4000/3 π = 1333 i 1/3 π
r kwadrat=100
r=10
V=1/3 pi r3=1000/3 pi-objętość
r3- r do potegi 3
1/3 jedna trzecia
4Pi r2= 400Pi/:4
r2=100
r=pierw z 100
r=10
V=4/3 pi r3= 4/3 Pi*1000= 4000/3= 1333 1/3 Pi cm3