答案是30度
參考資料：https://zh.wikipedia.org/wiki/%E5%85%B0%E5%88%A9%E7%9A%84%E4%B8%8D%E5%AE%9A%E8%A7%92%E5%BA%A6%E9%97%AE%E9%A2%98
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答案是30度
參考資料：https://zh.wikipedia.org/wiki/%E5%85%B0%E5%88%A9%E7%9A%84%E4%B8%8D%E5%AE%9A%E8%A7%92%E5%BA%A6%E9%97%AE%E9%A2%98
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