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Answer:
a=20°
b=40°
c=120°
Step-by-step explanation:
the angle sum in a triangle is 180°
so in the given triangle, the angles are 120 and 40
so the third one would be180-(120+40)=20°
a=20°
40 and b are alternate interior angles so they would be equal
b=40°
in the same way, 120and c are alternate interior angles so they would also be equal.
c=120°
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