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[几何] 动点轨迹长度

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guanmo1 posted 2017-5-13 21:24 |Read mode
动点轨迹长度.png

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色k posted 2017-5-13 22:04
作个投影就是了,轨迹是圆弧,具体数据自己算

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original poster guanmo1 posted 2017-5-14 21:54
回复 2# 色k

是作投影,应该是圆,半径是2倍根号3,所以周长应为4倍根号3pi,但答案是24倍pi。不知道咋回事。

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色k posted 2017-5-14 22:22
回复 3# guanmo1

答案错了呗

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original poster guanmo1 posted 2017-5-14 22:29
回复 4# 色k


    好吧,您可算了?是不是4倍根号3pi?

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色k posted 2017-5-15 00:28
你对自己这么没信心吗?

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original poster guanmo1 posted 2017-5-15 06:13
回复 6# 色k


    是的,没办法,看着答案错了,自己更加没信心了。

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