如图,四边形ABCD的对角线AC,BD交于点F,点E是BD上一点,且∠BAC=∠BDC=∠DAE.
(1)求证:△ABE∽△ACD;
(2)若BC=2,AD=6,DE=3,求AC的长.
(1)求证:△ABE∽△ACD;
(2)若BC=2,AD=6,DE=3,求AC的长.
![](https://img.xkw.com/dksih/QBM/2019/1/2/2110104769527808/2112402039832576/STEM/7e3eee0c41f04675a02fd1d1b2bffecf.png?resizew=161)
更新时间:2016-12-05 22:45:37
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【知识点】 相似三角形的判定与性质综合
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【推荐1】如图,⊙O是△ABD的外接圆,AB为直径.点C是弧AD的中点,连接OC,BC分别交AD于点E,F.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923250273312768/3057968609271808/STEM/0aa7cf3abc924c38be53467e227c0fd4.png?resizew=201)
(1)求证:∠CAD=∠CBA;
(2)若AB=10,BC=8,求OE的长.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923250273312768/3057968609271808/STEM/0aa7cf3abc924c38be53467e227c0fd4.png?resizew=201)
(1)求证:∠CAD=∠CBA;
(2)若AB=10,BC=8,求OE的长.
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解答题-证明题
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适中
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【推荐2】如图,M为正方形
中一点,
.
(1)如图(1),将正方形
分割成与
全等的四个直角三角形和小正方形
.我国汉代数学家赵炎在注解《周髀算经》时,用这个图案证明了勾股定理.若
,
的周长为30,求小正方形的面积;
(2)如图(2),连接
,以
为边作
,延长
交
于点E.求证:
;
(3)如图(3),延长
至H,使
,连接
并延长与
相交于点G,若
,正方形的边长为13,直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15148cae568d8960c62a4d0eddf5b03b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/7/edc0d573-b4c5-4848-a47c-3d6792aac14c.png?resizew=452)
(1)如图(1),将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ae03c682a0e79cbb1bbc9bc6e907e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
(2)如图(2),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2f4b7cb59bbe18758ec41156defbb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9df24b99f9a4adbadf7bbe02cddf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac94e7967b7796ffb99dd8a37ac6c9f4.png)
(3)如图(3),延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b50cfc40fb6cb9a4b0a7c77a0bc86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cba326a076b0be5fb00d74a4b19ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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