A dog is tied to a post by a piece of string 50 cm long . The dog runs round the post.While the dog runs , the string remains taut and does not coil around the post . Sketch the locus of the dog.
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收錄日期: 2021-04-13 17:42:41
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https://hk.answers.yahoo.com/question/index?qid=20101219000051KK01413