Odpowiedź :
[tex]Zadanie\\\\e=6\ cm\\\\P=26\ cm^{2}\\\\f=?\\\\P=\frac{e\cdot f}{2}\\\\\frac{6\cdot f}{2} =26\ \ \ \mid\cdot26\\\\6f=52\ \ \ \mid:6\\\\f=8\frac{4}{6}= 8\frac{2}{3}\ cm[/tex]
[tex]Zadanie\\\\e=6\ cm\\\\P=26\ cm^{2}\\\\f=?\\\\P=\frac{e\cdot f}{2}\\\\\frac{6\cdot f}{2} =26\ \ \ \mid\cdot26\\\\6f=52\ \ \ \mid:6\\\\f=8\frac{4}{6}= 8\frac{2}{3}\ cm[/tex]