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2014-10-28T17:32:34+02:00
A= \frac{ L^{2}  \sqrt{3}}{4}
P=3L
 9\sqrt{3} = \frac{  L^{2} \sqrt{3} }{4}
=> 36\sqrt{3} = L^{2} \sqrt{3} => L^{2} =36 => L=6 \\ P=3L => P=18[/tex]
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