[tex]P=a^{2} \\12cm^{2}=a^{2} \\a=\sqrt{12} \\a=2\sqrt{3} \\Obw=4*2\sqrt{3} =8\sqrt{3}[/tex]
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[tex]P=a^{2} \\12cm^{2}=a^{2} \\a=\sqrt{12} \\a=2\sqrt{3} \\Obw=4*2\sqrt{3} =8\sqrt{3}[/tex]