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[几何] 面积问题

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lrh2006 posted 2022-4-5 13:58 |Read mode
IMG_20220405_134705.jpg
IMG_20220405_134734.jpg

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kuing posted 2022-4-6 01:46
依题意有 `\S{CDG}:\S{CDA}=4:3`,作 AI、GJ 垂直 CD 于 I、J,则 `AI:GJ=3:4`。
设 `AI=3x`, `GJ=4x`,则可得到其余线段如下图所示:
QQ截图20220406014627.png

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original poster lrh2006 posted 2022-4-6 15:38
回复 2# kuing
明白了,哎,还是自己太low了
谢谢啦

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kuing posted 2022-4-6 15:54
回复 3# lrh2006

补充一下,推 MN 那里用 `MN:AI=CN:CI` 即 `MN:3x=4x:9x \riff MN=4x/3` 这样简单一点。

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original poster lrh2006 posted 2022-4-6 16:14
回复 4# kuing

kk老师精益求精呀!
嗯,是我学习的榜样嘻嘻

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