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Question
Number of angles less than 180° in the following figure is ______ and their names are ______.

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Solution
Number of angles less than 180° in the following figure is 12 and their names are ∠OAB, ∠OBA, ∠OAC, ∠OCA, ∠OCD, ∠ODC, ∠AOB, ∠AOC, ∠COD, ∠DOB, ∠BAC, ∠ACD.

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