m(<BEC)=m(<BFC)=[tex] \frac{m(arcBC)}{2} = \frac{70^{0}}{2} =35 ^{0} [/tex]
m(<EBF)=m(<ECF)=[tex] \frac{m(arcEF)}{2} = \frac{30^{0}}{2} =15 ^{0} [/tex]
m(<BDE)=m(<CDF)=180*-m(<EBF)-m(<BEC)=180*-15*-45*=130*
m(<BDC)=m(<EDF)=180*-m(<BDE)=180*-130*=50*
m(<BFA)=m(<CEA)=180*-m(<BEC)=180*-45*=135*
m(<BAC)=360*-m(<DEA)-m(<DFA)-m(<EDF)=360*-135*-135*-50*=40*
