Răspuns:
[tex]a)a = 25 \sqrt{3} \\ \frac{ {l}^{2} \sqrt{3} }{4} = 25 \sqrt{3} \\ {l}^{2} \sqrt{3} = 25 \sqrt{3} \times 4 \\ {l}^{2} \sqrt{3} = 100 \sqrt{3} \\ {l}^{2} = 100 \sqrt{3} \div \sqrt{3} \\ {l}^{2} = 100 \\ l = \sqrt{100} = 10cm \\ h = \frac{l \sqrt{3} }{2} = \frac{10 \sqrt{3} }{2} = 5 \sqrt{3} cm[/tex]
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