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a²√3:4=36√3cm²/:√3
a²=36×4
a²=144
a=12cm
czyli:
r=6cm
l=12cm
h=a√3:2=12√3:2=6√3cm
pole boczne:πrl=π×6×12=72πcm²
v=⅓πr²h=⅓π×6²×6√3=72√3πcm³