如图所示,将矩形ABCD沿AF折叠,使点D落在BC边的点E处,过点E作
交AF于点G,连接DG.
(1)求证:四边形EFDG是菱形;
(2)求证:
;
(3)若
,折痕AF=5
cm,则矩形ABCD的周长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7eb5fb41884fc7b27f2f2c6ef1ea4d.png)
(1)求证:四边形EFDG是菱形;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914bd1f027842d3266ee595e2b6ed080.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0d5d5d358829b33d575021c25c6bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/d2bcac1d-2bb4-4c84-8022-0b3260f97fef.png?resizew=164)
更新时间:2017-05-12 05:12:58
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,
,点F是
上一点,若将
沿
折叠,点C恰好与
上的点E重合,过点E作
交
于点G,连接
.
(1)求证:四边形
是菱形;
(2)当
时,求点B到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c05420ab262912cf41f46bc3b0af070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d819c261ee68e705e0d71815a050b7aa.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,四边形
是平行四边形,
的平分线交
边于点
,
的平分线交
边于点
,
和
相交于点
,连接
.
(1)根据题意将图形补画完整(要求尺规作图,保留作图痕迹,标注相应字母,不写作法);
(2)求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(1)根据题意将图形补画完整(要求尺规作图,保留作图痕迹,标注相应字母,不写作法);
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/85d60800-2250-4560-a7de-daf4a0a9df7b.png?resizew=183)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,已知以
为直径的
与锐角
的边
交于点
,与边
交于点
,过点
作
,垂足为点
,连接
,
.
;
(2)若
.
①求证:
是
的切线;
②若
,
,求
,
和弧
围成的阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca46e54d8a1aa18608fa654bc8646a91.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6247d0dae1512a44ce73efbc42ac47cc.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/490f0c21a0bfecc1447d54803af0b119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac65c83e0895c8dff93038ac5d1c72a.png)
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解答题-作图题
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【推荐2】如图,在△ABC中,AB=AC=4,∠A=36°.在AC边上确定点D,使得△ABD与△BCD都是等腰三角形,并求BC的长(要求:尺规作图,保留作图痕迹,不写作法)
![](https://img.xkw.com/dksih/QBM/2019/7/8/2242445800292352/2243279389646848/STEM/bcc14656a7ed475a9cc2d3492676ff92.png?resizew=117)
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解答题-证明题
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适中
(0.65)
真题
解题方法
【推荐1】如图,在△ABC中,以AB为直径作⊙O交BC于点D,∠DAC=∠B.
(1)求证:AC是⊙O的切线;
(2)点E是AB上一点,若∠BCE=∠B,tan∠B=
,⊙O的半径是4,求EC的长.
(1)求证:AC是⊙O的切线;
(2)点E是AB上一点,若∠BCE=∠B,tan∠B=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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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,已知抛物线y=ax2+bx+c与x轴交于A、B两点,与y轴交于点C,且OC2=OA·OB.
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366368331194368/2367001061793792/STEM/6168c4af515d43739a1f47f399867192.png?resizew=262)
(1)证明:tan∠BAC· tan∠ABC=1;
(2)若点C的坐标为(0,2),tan∠OCB=2,
①求该抛物线的表达式;
②若点D是该抛物线上的一点,且位于直线BC上方,当四边形ABDC的面积最大时,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366368331194368/2367001061793792/STEM/6168c4af515d43739a1f47f399867192.png?resizew=262)
(1)证明:tan∠BAC· tan∠ABC=1;
(2)若点C的坐标为(0,2),tan∠OCB=2,
①求该抛物线的表达式;
②若点D是该抛物线上的一点,且位于直线BC上方,当四边形ABDC的面积最大时,求点D的坐标.
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