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Measure of angle 1???

Measure of angle 1???-example-1
User Dispix
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Since you are given the angle 110 degrees, you subtract that from 180 and get 70 so angle 1 is 70 degrees
User Tasawer Nawaz
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Take a look at that 110-degree angle. Its supplement is 180-110, or 70, degrees. Angle CAB = Angle CDB, so Angle 1 is 70 degrees.

User Joe Witt
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