Odpowiedź:
a = 12 cm
Szczegółowe wyjaśnienie:
[tex]P = 24 \ cm^{2}\\a = 3h \ \ \rightarrow \ \ h = \frac{a}{3}\\a = ?\\\\\\P = \frac{1}{2}ah=\frac{1}{2}a\cdot\frac{a}{3}=\frac{a^{2}}{6} \\i\\P = 24 \ cm^{2}}\\\\\frac{a^{2}}{6} = 24 \ \ \ |\cdot 6\\\\a^{2} = 144\\\\a = \sqrt{144}\\\\\boxed{a = 12 \ cm}[/tex]
