Odpowiedź :
[tex] \frac{ {a}^{2} \sqrt{3} }{4} = 18 \sqrt{3} | \times 4 \\ {a}^{2} \sqrt{3} = 72 \sqrt{3} | \div \sqrt{3} \\ {a}^{2} = 72 \\ a = \sqrt{72} \\ a = \sqrt{36 \times 2} \\ \boxed{a = 6 \sqrt{2} }[/tex]
[tex] \frac{ {a}^{2} \sqrt{3} }{4} = 18 \sqrt{3} | \times 4 \\ {a}^{2} \sqrt{3} = 72 \sqrt{3} | \div \sqrt{3} \\ {a}^{2} = 72 \\ a = \sqrt{72} \\ a = \sqrt{36 \times 2} \\ \boxed{a = 6 \sqrt{2} }[/tex]