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Obw.podst=πl=12π[cm]
r-promien podstawy
r=Obw.podst/2π=12π/2π=6[cm]
h-wysokosc stozka
z Pitagorasa
h²=l²-r²
h²=144-36
h²=108
h=6√3
V=⅓πr²h=⅓×36π×6√3=72√3π[cm³]