b=80°
d=b=80°
a=c
a+c=360-(80+80)=360-160=200°
a=200/2=100°
c=a=100°
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b=80°
d=b=80°
a=c
a+c=360-(80+80)=360-160=200°
a=200/2=100°
c=a=100°