Question

dau coroana va rog !!!!!

Answer 1

Sper că te-am ajutat! Mult noroc la școală!

Answer 2

$\it DE||BC\ \stackrel{T.f.a.}{\Longrightarrow}\ \Delta ADE\sim\Delta ABC \Rightarrow \dfrac{AD}{AB}=\dfrac{\ 6^{(6}}{18}=\dfrac{1}{3}=k\ (raportul\ de\ asem\breve anare) \Rightarrow\\ \\ \\ \Rightarrow\dfrac{\mathcal{P}_{ADE}}{\mathcal{P}_{ABC}}=k=\dfrac{1}{3}\ \ \ \ \ (1)\\ \\ \\ \mathcal{P}_{ABC} =18+15+12=45\ cm\ \ \ \ \ (2)\\ \\ \\ (1),\ (2) \Rightarrow \dfrac{\mathcal{P}_{ADE}}{45}=\dfrac{1}{3} \Rightarrow \mathcal{P}_{ADE}=\dfrac{45}{3}=15\ cm$