Answer : 110 degree
To find angle 1 , we apply outside angle theorem Lets name each point Measurement of arc EF=280 degrees
Measurement of arc GH = 60
Angle D = angle 1
Please refer to the theorem attached below
[tex]angle D = \frac{arc(EF)-arc(GH)}{2}[/tex]
Now we plug in the values
[tex]angle 1 = \frac{280-60}{2}[/tex]
angle 1 = 110
Measurement of angle 1 = 110 degrees
