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Ob=?
P=6√3
P=3a²√3/2
Ob=6a
3a²√3/2=6√3 /*2
3a²√3=12√3 /:√3
3a²=12 /:3
a²=4
a=2
Ob=6*2
Ob=12
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Ob=?
P=6√3
P=3a²√3/2
Ob=6a
3a²√3/2=6√3 /*2
3a²√3=12√3 /:√3
3a²=12 /:3
a²=4
a=2
Ob=6*2
Ob=12