a.arcAE= 360° -70° -80° -50° -40° =120°
b. <BAC= arcBC /2 = 40°
c. <AEB= arcAB/2=70°/2=35°
d. <EBD= arcED= 40°/2= 20°
e. <DEC= arcDC= 50°/2 = 25°
f. <BAE = arc(BC+CD+DE)/2 = ( 80°+50°+40°)/2=85°
g. <ABD=arc(AE+ED)/2= (120°+40°)/2= 80°
h. <AEC=arc(AB+BC)/2= arc(70°+80°)/2=75°
i. <EDC=arc(AE+AB+BC)/2=(120°+70°+80 °)/2=135°
j. <BCE= arc(120+70)/2 = 95
