如图,以平行四边形
的边
分别作等边
和等边
.
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf3c19de60555f4928d1ef1ce99a20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437928022228992/2439016957911040/STEM/7cf77575-7dd5-41f8-af8d-a98b82a67d41.png?resizew=202)
更新时间:2020-04-11 08:55:36
|
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解答题-证明题
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适中
(0.65)
【推荐1】如图,平行四边形
,对角线
交于点
,
,连接
并延长与
的延长线交于点
,与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/e68d8f5d-5650-4861-b12a-72fcf6acfd05.png?resizew=225)
(1)试判断四边形
的形状,并证明;
(2)若平行四边形
的面积是
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef790122ae3cf8188c8d535cf2f344ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/e68d8f5d-5650-4861-b12a-72fcf6acfd05.png?resizew=225)
(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9186e4574ffe28e673724fcb019db208.png)
(2)若平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐2】如图,△ABC的外角∠DAC的平分线交BC边的垂直平分线于P点,PD⊥AB于点D.PE⊥AC于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/972ab25f-1ced-4e70-8dd1-427590dc167c.png?resizew=280)
(1)求证:BD = CE;
(2)求证:AC = AB + 2AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/972ab25f-1ced-4e70-8dd1-427590dc167c.png?resizew=280)
(1)求证:BD = CE;
(2)求证:AC = AB + 2AD.
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适中
(0.65)
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【推荐1】已知:平面直角坐标系中,点A在y轴的正半轴上,点B在第二象限,AO=AB,BO与x轴正方向的夹角为150°.
(1)试判定△ABO的形状;
(2)如图1,若BC⊥BO,BC=BO,点D为CO的中点,AC、DB交于E,求证:AE=BE+CE;
(3)如图2,若点E为y轴的正半轴上一动点,以BE为边作等边△BEG,延长GA交x轴于点P,问:AP与AO之间有何数量关系,试证明你的结论.
(1)试判定△ABO的形状;
(2)如图1,若BC⊥BO,BC=BO,点D为CO的中点,AC、DB交于E,求证:AE=BE+CE;
(3)如图2,若点E为y轴的正半轴上一动点,以BE为边作等边△BEG,延长GA交x轴于点P,问:AP与AO之间有何数量关系,试证明你的结论.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889232514908160/2890042028793856/STEM/106bf8c6-5ce9-4a42-a45b-19e864094d08.png?resizew=527)
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解答题-证明题
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适中
(0.65)
【推荐2】已知:如图,△ABC是等边三角形,过AC边上的点D作DG∥BC,交AB于点G,在GD的延长线上取点E,使DE=DC,连接AE、BD.
(1)求证:△AGE≌△DAB;
(2)过点E作EF∥DB,交BC于点F,连AF,求∠AFE的度数.
(1)求证:△AGE≌△DAB;
(2)过点E作EF∥DB,交BC于点F,连AF,求∠AFE的度数.
![](https://img.xkw.com/dksih/QBM/2011/11/2/1573274992705536/null/STEM/899dbefe788e43888d2faffbe53dad8a.png?resizew=182)
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