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User Moritz Mahringer
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Explanation:

An inscribed angle is half the arc angle.

m∠MNQ = 80°/2

m∠MNQ = 40°

The angle between two chords is the average of the arc angles.

m∠AMB = (80° + 85°) / 2

m∠AMB = 82.5°

User Antonio Carito
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