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P=a²√3:4
P=6√3
a²√3:4=6√3
a²=24
a=√24=2√6cm
r=a√3:6
r=2√6√3:6
r=√18:3
r=3√2:3=√2cm
Ob=2πr
Ob=2π√2
Ob=2√2πcm