[tex]\it \left.\begin{aligned} \it A_2=3A_3+2^o \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \\ \it A_2+A_3=180^o \Rightarrow A_2=180^o-A_3\end{aligned}\right\} \Rightarrow 3A_3+2^o=180^o-A_3 \Rightarrow \\ \\ \\ \Rightarrow 3A_3+A_3=180^o-2^o \Rightarrow 4A_3=178^o|_{:2} \Rightarrow 2A_3=89^o \Rightarrow \\ \\ 2A_3=88^o60'|_{:2} \Rightarrow A_3=44^o30'[/tex]
[tex]\it A_2=180^o-44^o30'=179^o60'-44^o30'=135^o30'[/tex]
[tex]\it A_1=A_3=44^o30'\ (opuse\ la\ v\hat arf)\\ \\ A_4=A_2=135^o30'\ (opuse\ la\ v\hat arf)[/tex]
