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[几何] 怎么作出园K,与园Z内切,又与AB,CD相切?

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dodonaomik posted 2016-5-23 00:05 |Read mode

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isee posted 2016-5-22 13:10
当AB是直径时:

forum.php?mod=viewthread&tid=2688

第一题。

不是直径就没看了。

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游客 posted 2016-5-22 21:04
未命名.PNG

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original poster dodonaomik posted 2016-5-23 00:03
Last edited by hbghlyj 2025-5-11 19:33首先
激烈感谢大家尽力的帮忙,
大力帮忙,
让我见到柳暗花明~~~~


但是,作图。咋不行呢?【看了证明还很简单的!之后,觉得“作图”本应很简单的】

_________________________
DUI对!就是做一个圆,与【一弧,一弦,一直径】相切
文字部分,是越南咖啡豆农民的苦难~~呵呵,不好意思,拖累大家啦

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kuing posted 2016-5-23 00:21
那其实还是 LLC 作图吧,还是之前和你聊过的那种方法,将圆缩成点,同时移动直线,变成 PLL

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kuing posted 2016-5-23 02:08
鉴于PLL比较好作,闲来无事,搞个GIF演示图玩玩

第一步平移,第二步作PLL,最后返回原来的图上

注:这里最终作了两个圆出来,同理可作其他的,由不同的平移方向即可得出不同的相切情况的圆,一种对应两个,四种平移方式,故共可作出八个圆。
LLC转化为PLL,GIF演示.gif

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original poster dodonaomik posted 2016-5-23 05:50
回复 9# kuing

问题是,
为啥不能吧
O'E=O'M
BM=BC
利用起来?

截图04.jpg

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kuing posted 2016-5-23 12:24
回复 10# dodonaomik

我作的是一般情况(5楼的图),你这个图是特殊情况,而且二楼的链接里不是说得很清楚了么,你既然也知道了BM=BC,那还不会作吗?

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kuing posted 2016-5-23 13:31
唉……
简单情形.gif

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original poster dodonaomik posted 2016-5-23 14:44
руру
呵呵,我搞的太粗糙啦~~~没做垂直线,
直接用角平分线与圆弧来个交点

太粗心鸟

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original poster dodonaomik posted 2016-5-23 14:51
截图04.jpg

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realnumber posted 2016-5-23 16:20
唉……

当老师不容易啊~~~~

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