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A = \frac{a^2 \sqrt{3}}{4}
h = \frac{a \sqrt{3}}{2}
P = 3a
$ A = \frac{a^2 \sqrt{3}}{4} $
$ h = \frac{a \sqrt{3}}{2} $
$ a = \sqrt{\frac{4A}{\sqrt{3}}} $
$ a = \frac{2h}{\sqrt{3}} $