如图,过△DBE点D作直线l∥BE,以点B为圆心,BD为半径作弧交直线l于点A.
(1)求证:∠BAD=∠DBE;
(2)在AD上截取AC=BE,求证:四边形BEDC是等腰梯形.
(1)求证:∠BAD=∠DBE;
(2)在AD上截取AC=BE,求证:四边形BEDC是等腰梯形.
![](https://img.xkw.com/dksih/QBM/2019/5/22/2209076762820608/2209729547059200/STEM/001628f077aa4bb294137b039fdd9178.png?resizew=252)
更新时间:2019-05-23 10:09:11
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【推荐1】探究问题:已知
,画一个角
,使
,
,且
交
于点
.
与
有怎样的数量关系?
与
有两种位置关系:如图1与图2所示.
①图1中
与
数量关系为__________;
图2中
与
数量关系为__________;
因此得出一个真命题(用文字叙述):__________.
②请选择其中一幅图证明结论.
(2)根据①所得的结论,解决以下问题:若两个角的两边互相平行,且一个角比另一个角的2倍少
,请直接写出这两个角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
①图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
因此得出一个真命题(用文字叙述):__________.
②请选择其中一幅图证明结论.
(2)根据①所得的结论,解决以下问题:若两个角的两边互相平行,且一个角比另一个角的2倍少
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
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【推荐2】如图
,,
的顶点F、G分别落在直线
AB、
上,
交
于点H,
平分
.若
,
,求
的度数.
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【推荐1】已知:
,点
,
分别在
,
上,且
.
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(1)如图
,求证:
;
(2)如图
,
交
于点
,连接
,在不添加任何辅助线的情况下,请直接写出图
中四对全等的三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(1)如图
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(2)如图
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,AB是
的直径,AC是弦,
于点D,过点A作
的切线AP,与OD的延长线交于点P,连接CP,与AB的延长线交于点E.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978472191598592/2979046602203136/STEM/6f940ac4-30a7-456d-94dc-1cada875a609.png?resizew=194)
(1)求证:PC是
的切线;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(2)求证:
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【推荐1】(1)如图1:已知
中,以
,
为直角边向外作等腰直角三角形
和等腰直角三角形
,连接
,
,则
与
的数量关系为:____;(直接填写结果,不需要说明理由)
(2)如图2,已知
,以
,
为边向外作等边三角形
和等边三角形
,连接
,
,试判断
与
有什么数量关系?并说明理由;
(3)如图3,要测量池塘两岸相对的两点
,
之间的距离,已经测得
,
,
米,
米,且
,求
的长.
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(2)如图2,已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)如图3,要测量池塘两岸相对的两点
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【推荐2】如图,AB是⊙O的弦,OP⊥OA交AB于点P,过点B的直线交OP的延长线于点C,且CP=CB.
(1)求证:BC是⊙O的切线;
(2)若⊙O的半径为3,OP=1,求BC的长.
(1)求证:BC是⊙O的切线;
(2)若⊙O的半径为3,OP=1,求BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/3cd0664f-372e-4b65-a247-fb3b2e48d34c.png?resizew=173)
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【推荐1】如图,梯形ABCD中,AB//CD,AD=BC,延长AB到E,使BE=DC,连结AC、CE.求证AC=CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/a3372ef3-844c-42e9-8b3a-fa98385dc12a.png?resizew=152)
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解答题-证明题
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【推荐2】如图,
是
的直径,
和
是它的两条切线,
切
于点
,交
于点
,交
于点
,
是
的中点,连接
.
(1)求证:
;
(2)猜想:
与
有何数量关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/1ca5d90b-c23d-4619-97cc-205388acca89.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd4bdd824297c690dfac4846fa6fb2d.png)
(2)猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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