如图,在△ABC中,AD平分∠BAC,∠C=2∠B,试判断AB,AC,CD三者之间的数量关系,并说明理由.(想一想,你会几种方法)
![](https://img.xkw.com/dksih/QBM/2018/1/13/1859517088653312/1860867104563200/STEM/e6c89c3ca4744aebbaeae8a20933dc07.png?resizew=187)
16-17八年级上·安徽合肥·期末 查看更多[1]
(已下线)安徽省合肥市2016~17学年度第一学期 期末教学质量检测 八年级数学试题
更新时间:2018-01-15 12:46:43
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【知识点】 全等的性质和SAS综合(SAS)解读
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,对角线AC,BD相交于点O,点E,F分别为OB,OD的中点,延长AE至G,使EG=AE,连接CF,CG.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/aea9b8c1-0eb0-42c6-a841-7fa87b698277.png?resizew=170)
(1) 求证:
;
(2)若AB=
,AC=10,BD=12.直接写出四边形EGCF的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/aea9b8c1-0eb0-42c6-a841-7fa87b698277.png?resizew=170)
(1) 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0880b863a94d0b04f2e12d184df6970c.png)
(2)若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】定义:正方形
内部一点
,若
是直角,则称
为
边上的弦图三角形(如图
.
中,点
分别是
,
上两点,
交于点
,若
,求证:
是
边上的弦图三角形.
(2)如图3,正方形
中,
是
边上的弦图三角形,点
为
中点,若正方形边长为2,
①直接写出
的长为 ;
的最小值为 .
②若
(如图
求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcf8a317ccc87a1bf8e17852fddbe29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ec45f0c2f54e0db3bfa9c5b6ce5c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48cec75659b1d551802d0b41d2fa3db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图3,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879341ea720f6671a6222711a8854f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c49a8ba3024d05511eed8c96d3a68f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693ca42a80bd3d661fc5de6b5df2e8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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