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Question
Number of angles less than 180° in figure is ______ and their names are ______.
Solution
Number of angles less than 180° in figure is 12 and their names are ∠ABO, ∠BAO, ∠AOB, ∠BOD, ∠COD, ∠ODC, ∠OCD, ∠OCA, ∠CAO, ∠AOC, ∠BAC and ∠ACD.
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