Question

va rog, exercitiul 12, rapid
dau coroana, follow, ce vreti voi, fara prostii, doar un raspuns acceptabil​

Answer 1

$\it \left.\begin{aligned}MN-linie\ mijlocie\ \^{\i}n\ \Delta ABC \Rightarrow MN||AC \\\\ PQ - linie\ mijlocie\ \^{\i}n\ \Delta CDA \Rightarrow PQ||AC\end{aligned}\right\} \Rightarrow MN||PQ\ \ \ \ (1)\\ \\ \\ \left.\begin{aligned}NP-linie\ mijlocie\ \^{\i}n\ \Delta BCD \Rightarrow NP||BD \\\\ QM - linie\ mijlocie\ \^{\i}n\ \Delta DAB \Rightarrow QM||BD\end{aligned}\right\} \Rightarrow NP||QM\ \ \ \ (2)$

$\it (1),\ (3) \Rightarrow MNPQ\ -\ paralelogram$

( Laturile opuse sunt paralele )