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ANSWER

               1)  HINT: Use Exterior angle property
               2)  HINT: Use Angle sum  property of a triangle

                                           0
               3)  Figure -1:HINT: <y = 80 , <x = use angle sum property o a triangle

                   HINT: Figure -2: <x = <y (vertical opposite angles)


                             Similarly, measure of each angle is <x i.e the given triangle is an equilateral
                   triangle.
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