s=\frac{\sqrt{3}}{4}*a^{2}=\frac{\sqrt{3}}{4}*12^{2}=\frac{\sqrt{3}}{4}*144=36\sqrt{3}
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s=\frac{\sqrt{3}}{4}*a^{2}=\frac{\sqrt{3}}{4}*12^{2}=\frac{\sqrt{3}}{4}*144=36\sqrt{3}