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V= π/6 V=4/3 πr^ wzor na objętość kuli
π/6 = 4/3 πr^ |*6
π =8πr^ |:8π
π/8π = r^
1/8=r^
r=1/2
b. ^ oznacza potege 2
Pc=2π Pc= 4πr^ - wzor na pole kuli
2π=4πr^ |:4π
2π/4π = r^
r^=1/2
r=√(1/2)