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説明の都合上、角を図のように名付けます
円周角の定理より、中心角＝円周角×2なので、
∠AOC＝2∠ABC
∠AOC＝2×115°＝230°
∠COD＝∠AOC−AOD
∠x ＝230°−180°＝50° となります
いえいえ^_^
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