[tex]\it [OE-bisectoare \Rightarrow \widehat{BOA} =2\cdot35^o=70^o[/tex]
[tex]\it [OF-bisectoare \Rightarrow \widehat{COB} =2\cdot85^o=170^o \\ \\ x+3x+170^o+70^o=360^o \Rightarrow 4x+240^o=360^o \Rightarrow 4x=360^o-240^o \Rightarrow\\ \\ \Rightarrow 4x=120^o \Rightarrow x=120^o:4 \Rightarrow x=30^o[/tex]