[积分] 极座标弧长推导

楼主: lin546997987 (大雨哗啦啦)   2017-07-22 12:53:14
http://i.imgur.com/fhNJO32.jpg
请问为何底线处是rdΘ
那段是当扇形看吗?
楼主: lin546997987 (大雨哗啦啦)   2017-07-23 11:59:00
感谢楼上~~

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