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więc:
0,2*pi=(pi*r^2*h)/3 l *3
0,6*pi=pi*0,5^2*h l /pi
0,6=0,25h l /0,25
h=2,4
Pozdrowienia! ; )
0,2πcm³=1/3×0,5²π×H
0,2πcm³= 1/3 0,25π×H /×3
0,6πcm³=0,25π×H /÷0,25π
H=2,4