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a²√3/4=9√3
a²/4=9
a²=36
a=6
Potrzebna nam jeszcze wysokosc ktora liczymy z pitagorasa
a²-(a/2)²=H²
36-9=H²
27=H²
H=3√3
r=a/2
V= 1/3 * Pir² * H
V= 1/3 * Pi *9 * 3√3
V=9√3Pi cm³