a°
a°+140° = 180°
a°= 180°-140°
a°= 40°
b°
b°+60°+a° = 180°
b°+60°+40° = 180°
b°+100° = 180°
b° = 180°-100°
b° = 80°
c°
c° = 60°+a°
c° = 60°+40°
c° = 100°
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a°
a°+140° = 180°
a°= 180°-140°
a°= 40°
b°
b°+60°+a° = 180°
b°+60°+40° = 180°
b°+100° = 180°
b° = 180°-100°
b° = 80°
c°
c° = 60°+a°
c° = 60°+40°
c° = 100°