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Mathematics 10 Online
OpenStudy (anonymous):

http://assets.openstudy.com/document-icon.png In the diagram of circle O, chords AC¯¯¯¯¯ and BD¯¯¯¯¯ are perpendicular to each other. If m∠COD = 95° what is m∠AOB? 95° 90° 85° 80°

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