[tex]\widehat{AD}= 360^{\circ} -\widehat{AB}-\widehat{BC}-\widehat{CD}= 360^{\circ} -100^{\circ} -70^{\circ}-140^{\circ}=50^{\circ}[/tex]
duci linie de la a la 5
[tex]\widehat{ABC}= \widehat{AB}+\widehat{BC}= 100^{\circ} +70^{\circ}=170^{\circ}[/tex]
duci linie de la b la 3
[tex]\measuredangle CAD= \widehat{CD} : 2= 140^{\circ}:2=70^{\circ}[/tex]
duci linie de la c la 1
[tex]\measuredangle ACD= \widehat{AD} : 2= 50^{\circ}:2=25^{\circ}[/tex]
duci linie de la d la 4