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[几何] 弦与切线

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乌贼 posted 2015-4-10 00:32 |Read mode
Last edited by hbghlyj 2025-5-20 03:24

如图:$ AB $为圆$ O $上的弦,$ C $为$ AB $延长线上一点且$ AB=3BC ,CD$是圆$ O $的切线。求证:$AC=2CD$

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kuing posted 2015-4-10 00:59
回复 1# 乌贼

???这还用证?直接上切割线啊

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original poster 乌贼 posted 2015-4-10 01:09
脑袋被驴踢了

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isee posted 2015-4-10 09:37
初中把切割线定理删了好多年了,突然来个要用到这些东东的,就会像楼主这样

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其妙 posted 2015-4-12 15:29
回复  乌贼

???这还用证?直接上切割线啊
kuing 发表于 2015-4-10 00:59
乌贼潜水多年了,我看了这题是 乌贼 出的,都吓尿了,
乌贼还来这手空城计呀?

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