Punctul a)
[tex]180^{\circ}-45^{\circ}-50^{\circ}=85^{\circ}\\ 85^{\circ} +x=180^{\circ} \Rightarrow \tt x=95^{\circ}[/tex]
Punctul b)
[tex]180^{\circ}-60^{\circ}-40^{\circ}=80^{\circ}\\ 80^{\circ} +x=180^{\circ} \Rightarrow \tt x=100^{\circ}[/tex]
Punctul c)
[tex]180^{\circ}-30^{\circ}-30^{\circ}=120^{\circ}\\ 120^{\circ} +x=180^{\circ} \Rightarrow \tt x=60^{\circ}[/tex]
Obs: x se află adunând cele două unghiuri date.
