已知:如图,点D在
内部,连接
.若
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1a80f3d9daaba119b22cdc0183967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5efc4c192696de36f02f40ddd3be2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f820ef108b2d7e98cf4b9c2e276a0.png)
更新时间:2024-06-09 11:03:18
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解答题-证明题
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【推荐1】如图,点A、C、B、D在同一直线上,且AB=CD,AE∥DF,AE=DF.
求证:BE=CF.
求证:BE=CF.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313386980622336/2314382103486464/STEM/64b66bdf75ac4707a9f3223d75d27561.png?resizew=201)
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【推荐2】如图,在
中,
于D,E为线段
上一点,连接
交
于点F,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/ce15fbb7-a9bb-4571-b0c4-32aa1115beed.png?resizew=184)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b9f98fe35d1baada6fa249d117363e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/ce15fbb7-a9bb-4571-b0c4-32aa1115beed.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df9327f2d81d6eb1f92f582f5d82a83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e33087839a92fbf3dc260aeea8af8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
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解答题-作图题
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【推荐1】如图,在平行四边形
中,按以下步骤作图:①分别以点B,D为圆心,以大于
的长为半径画弧,两弧分别交于E,F两点;②连接
,分别交
,
,于点M,N,连接
,
,求证四边形
是菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81613520ab5a478f0b2616a9bcb79d1.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408e2d26c0c8a6594c4baba496a4651d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/1063c3a2-25ab-45ba-aa0e-a39d885c74dd.png?resizew=126)
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解答题-作图题
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【推荐2】下面是小明同学设计的“已知两条对角线长作菱形”的尺规作图过程.
已知:如图1,线段a.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/7ee61124-30ff-4e59-b77b-8a268f414fe5.png?resizew=390)
求作:菱形ABCD,使得对角线
,
.
作法:如图2,
①作射线AM,并在射线AM上截取
;
②作线段AC的垂直平分线PQ,PQ交AC于点O;
③以点O为圆心,a为半径作弧,交PQ于点B,D;
④连接AB,AD,BC,CD.
则四边形ABCD为所求作的菱形.
(1)用直尺和圆规,依作法补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:由作图可知
,
.
∵PQ为线段AC的垂直平分线,∴
.
∵
,
∴四边形ABCD是平行四边形(__________________)(填推理的依据).
又∵
,∴
是菱形(_________________)(填推理的依据).
已知:如图1,线段a.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/7ee61124-30ff-4e59-b77b-8a268f414fe5.png?resizew=390)
求作:菱形ABCD,使得对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63a6db0369438420d17777a0940a10e.png)
作法:如图2,
①作射线AM,并在射线AM上截取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
②作线段AC的垂直平分线PQ,PQ交AC于点O;
③以点O为圆心,a为半径作弧,交PQ于点B,D;
④连接AB,AD,BC,CD.
则四边形ABCD为所求作的菱形.
(1)用直尺和圆规,依作法补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:由作图可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63a6db0369438420d17777a0940a10e.png)
∵PQ为线段AC的垂直平分线,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
∴四边形ABCD是平行四边形(__________________)(填推理的依据).
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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解答题-问答题
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【推荐1】如图,在四边形
中,
,
是
的中点.连结
并延长,交
的延长线于点
,连结
.如果
,那么
是什么三角形?
是
的什么线段?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c562adb241caeba188b983f534a489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352220968624128/2352256390897664/STEM/bc1931221dbf43c79647bc975f617d6a.png?resizew=255)
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【推荐2】如图,在△ABC中,AB=AC,以AB为直径的⊙O分别与BC,AC交于点D,E,过点D作⊙O的切线DF,交AC于点F.
(1)求证:DF⊥AC;
(2)若⊙O的半径为4,∠C=67.5°,求阴影部分的面积.
(1)求证:DF⊥AC;
(2)若⊙O的半径为4,∠C=67.5°,求阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2020/10/10/2567896171429888/2568225550155777/STEM/b6af4156-31f2-48e3-9120-3b14b30ee5a7.png?resizew=189)
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