Răspuns:
12 cm
Explicație pas cu pas:
[tex]\frac{P_{ABC}}{P_{DEF}} = \sqrt{\frac{A_{ABC}}{A_{DEF}}} \\ \sqrt{\frac{A_{ABC}}{A_{DEF}}} = \sqrt{\frac{150}{6}} = \sqrt{25} = 5 \\ \frac{60}{P_{DEF}} = 5 \\ P_{DEF} = \frac{60}{5} = > P_{DEF} = 12 \: cm[/tex]