Odpowiedź :
[tex]h = \frac{a\sqrt{3}}{2}\\\\h = 21cm[/tex]
[tex]\frac{a\sqrt{3}}{2} = 21 | *2\\\\a\sqrt{3} = 42\\\\a = \frac{42}{\sqrt{3}} = \frac{42\sqrt{3}}{3} = 14\sqrt{3}\\\\a = 14\sqrt{3}\\[/tex]
[tex]h = \frac{a\sqrt{3}}{2}\\\\h = 21cm[/tex]
[tex]\frac{a\sqrt{3}}{2} = 21 | *2\\\\a\sqrt{3} = 42\\\\a = \frac{42}{\sqrt{3}} = \frac{42\sqrt{3}}{3} = 14\sqrt{3}\\\\a = 14\sqrt{3}\\[/tex]