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Can someone please help me with this?

Can someone please help me with this?-example-1
User Dooms
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Angle 1 is equal to 1/2 of the major arc minus the minor arc. Like this:
Angle 1= (220-60)/(2). Which is 160/2. So ∠1 is 80°, third choice above.
User Alvarodoune
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