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[几何] 空间轨迹

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青青子衿 posted 2014-5-24 17:04 |Read mode
空间有一定点A,到平面α的距离为d,空间存在一半径为R(R>d)且圆心为A的圆Γ,⊙Γ∩α=Β,圆Γ只能贴在平面上滚动,求圆Γ所扫过空间的体积
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original poster 青青子衿 posted 2014-5-24 17:07
回复 1# 青青子衿
实际上,由圆的对称性可将“贴在平面上滚动”改装为“贴在平面上滑动”
希望你早已想到!

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original poster 青青子衿 posted 2014-5-24 20:26
Last edited by 青青子衿 2014-6-20 16:58回复 2# 青青子衿
猜出来了没有,是球台(ps:与其叫做球台(不是乒乓球台),不如叫做球桶)
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三尺水 posted 2014-5-29 09:02
问题不难  建空间坐标系 Z=n 交斜着圆圈面距离最短到距离最长的为实心  积分求体积

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original poster 青青子衿 posted 2014-6-1 11:53
回复 4# 三尺水
但如果把A固定,A为直径AB的的一端点,圆心不固定问题就麻烦了!

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original poster 青青子衿 posted 2014-6-2 13:24
回复  三尺水
但如果把A固定,A为直径AB的的一端点,圆心不固定问题就麻烦了! ...
青青子衿 发表于 2014-6-1 11:53
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