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a=4cm
r=4√3/3
P=πr²=3,14*(4/3√3)²=3,14*16/3=16,74cm²
R=2/3h
h=a#3/2
#-pierwiastek kwadratowy
R=a#3/3
Pole koła=PI*R^2
P=PI*4#3/3