如图,在
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/372779f3-8ef5-472b-acd8-4c5c7d29a1ea.png?resizew=198)
(1)请用无刻度直尺和圆规,在边
上求作一点
,使得点
到
、
的距离相等;(不要求写作法,保留作图痕迹)
(2)在(1)的条件下,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3976d08e5f9e24e76ce9579c06a8dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/372779f3-8ef5-472b-acd8-4c5c7d29a1ea.png?resizew=198)
(1)请用无刻度直尺和圆规,在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2022-02-11 09:14:06
|
相似题推荐
解答题-作图题
|
适中
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名校
【推荐1】已知线段
,试用尺规作图画出线段
的黄金分割点C,使得
,保留作图痕迹,不写作法.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/f5c0d3a8-531d-4da0-8832-c63569efff13.png?resizew=198)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
真题
名校
【推荐2】如图,在
中,
,
.
是线段
的__________,射线
是
的__________;
(2)在(1)所作的图中,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c157441734cc2f1853bb3e15b631a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(2)在(1)所作的图中,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
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解答题-作图题
|
适中
(0.65)
真题
【推荐1】如图,在△ABC中,∠C=60°,∠A=40°.
![](https://img.xkw.com/dksih/QBM/2015/8/19/1573897411682304/1573897418186752/STEM/461c2692d21f41788b29f574a4c5d46a.png)
(1)用尺规作图作AB的垂直平分线,交AC于点D,交AB于点E(保留作图痕迹,不要求写作法和证明);
(2)求证:BD平分∠CBA.
![](https://img.xkw.com/dksih/QBM/2015/8/19/1573897411682304/1573897418186752/STEM/461c2692d21f41788b29f574a4c5d46a.png)
(1)用尺规作图作AB的垂直平分线,交AC于点D,交AB于点E(保留作图痕迹,不要求写作法和证明);
(2)求证:BD平分∠CBA.
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
,
,
,点O为边
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/35357d27-efe9-477c-8808-1609ac35556d.png?resizew=176)
(1)请用无刻度的直尺和圆规按要求作图:在
上作一点D,使得
;(不写作法,保留作图痕迹.)
(2)在(1)的条件下,连接
,若
,则
的面积为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15301873a51b67db462f4d78b8bffc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/35357d27-efe9-477c-8808-1609ac35556d.png?resizew=176)
(1)请用无刻度的直尺和圆规按要求作图:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5fab63b72493788e8b770bebffd7cd.png)
(2)在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ca4c9f67ce9d69c0369089e80aed74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
的两条弦
、
互相垂直,垂足为E,且
.
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/a11d9d8d-e449-479c-8acc-f3dd9e91cebb.png?resizew=124)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】背景阅读 早在三千多年前,我国周朝数学家商高就提出:将一根直尺折成一个直角,如果勾等于三,股等于四,那么弦就等于五.它被记载于我国古代著名数学著作《周髀算经》中,在本题中,我们把三边的比为
的三角形称为
型三角形,例如:三边长分别为9,12,15的三角形就是
型三角形,用矩形纸片按下面的操作方法可以折出这种类型的三角形.
实践操作 如图①,在矩形纸片
中,
cm,
cm.
第一步:如图②,将图①中的矩形纸片
沿过点A的直线折叠,使点D落在
上的点E处,折痕为
,再沿
折叠,然后把纸片展平.
第二步:如图③,将图②中的矩形纸片再次折叠,使点D与点F重合,折痕为
,然后展平,隐去
.
第三步:如图④,将图③中的矩形纸片沿
折叠,得到
,再沿
折叠,折痕为
与折痕
交于点N,然后展平.
问题解决
(1)请在图②中证明四边形
是正方形;
(2)请在图④中判断
与
的数量关系,并加以证明;
(3)请在图④中证明
是
型三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d44d5798d856568f7f6e5e91269ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
实践操作 如图①,在矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
第一步:如图②,将图①中的矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第二步:如图③,将图②中的矩形纸片再次折叠,使点D与点F重合,折痕为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
第三步:如图④,将图③中的矩形纸片沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88c6de1903f0783e762ae6b1fcf1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697530f197021c9f85a4272c4e9e6317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
问题解决
(1)请在图②中证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
(2)请在图④中判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7443b09d74b9180b1760662b8c10e608.png)
(3)请在图④中证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654a3aacb8539b4996023caf5b55c85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/199fcc40-a6e1-4340-a6cc-2a784c9afd30.png?resizew=376)
您最近一年使用:0次