[tex]\it Fie,\ x,\ y,\ z,\ t\ m \breve a surile\ celor\ patru\ unghiuri[/tex]
[tex]\it \dfrac{x}{6}=\dfrac{y}{8}=\dfrac{z}{4}=\dfrac{t}{6}=\dfrac{x+y+z+t}{6+8+4+6}=\dfrac{360^o}{24}=15^o\Rightarrow \begin{cases} \it x=6\cdot15^o=90^o\\ \\ \it y=8\cdot15^o=120^o\\ \\ \it z=4\cdot15^o=60^o\\ \\ \it t=6\cdot15^o=90^o\end{cases} \\ \\ \\ Trapezul\ \ este\ \ dreptunghic.[/tex]
