张师傅要将一张残缺的圆形轮片恢复原貌(如图),已知轮片的一条弦
的垂直平分线交弧
于点
,交弦
于点
,测得
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/10c363e3-6efe-44ef-a336-c7dd90cb93da.png?resizew=139)
(1)请你帮张师傅找出此残片所在圆的圆心(尺规作图,不写作法,保留作图痕迹);
(2)求(1)中所作圆的半径.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3433f3d99b827bb05e87d92faaf89f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8610ba53f34de2459b4644b0296532.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/10c363e3-6efe-44ef-a336-c7dd90cb93da.png?resizew=139)
(1)请你帮张师傅找出此残片所在圆的圆心(尺规作图,不写作法,保留作图痕迹);
(2)求(1)中所作圆的半径.
更新时间:2024-01-10 08:21:12
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相似题推荐
解答题-作图题
|
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【推荐1】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/5b519406-bf4b-4e46-9562-4d70b848fa6a.png?resizew=143)
(1)用尺规在边
上求作一点
,使
,并连接
.(不写作法,保留作图痕迹)
(2)当
为_______度时,
平分
;
(3)当
时,
的周长=__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/5b519406-bf4b-4e46-9562-4d70b848fa6a.png?resizew=143)
(1)用尺规在边
![](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/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4787b75810987e87f90c8df3755f5b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
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解答题-作图题
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名校
【推荐2】如图,
中,
,点O为边
中点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/be07ee2e-c722-4a52-96da-af84f8eb82a1.png?resizew=200)
(1)请用尺规作图在
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
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/be07ee2e-c722-4a52-96da-af84f8eb82a1.png?resizew=200)
(1)请用尺规作图在
![](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/372629a8666de1e9bac3e7daadcac7b6.png)
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解答题-作图题
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【推荐1】阅读与思考
在学习《直线与圆的位置关系》时,老师布置了一道课后探究题:
已知
外一点P(图1),你能用尺规过点
作
的切线吗?你有几种方法?
小聪同学积极探索作图方法,并且进行了原理说明和总结反思,以下是他的探索过程,请你仔细阅读,并完成相应的任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/7984f88e-ebe7-4da6-b5c7-792c1b494f8c.png?resizew=143)
任务:
(1)上述材料【原理说明】中的依据是________;
(2)如图
,在图
的基础上,在
上取一点
(不与点
,
重合),连接
,
,若
,求
的度数;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/e8aa383c-6f9d-4088-9506-dbfce370e6d2.png?resizew=143)
(3)请同学们根据小聪的【总结反思】尝试在图1中用尺规过点
作出
的一条切线.(要求:不写作法,保留作图痕迹)
在学习《直线与圆的位置关系》时,老师布置了一道课后探究题:
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
小聪同学积极探索作图方法,并且进行了原理说明和总结反思,以下是他的探索过程,请你仔细阅读,并完成相应的任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/7984f88e-ebe7-4da6-b5c7-792c1b494f8c.png?resizew=143)
【题目分析】 先画草图,发现若 ![]() ![]() ![]() ![]() ![]() ![]() 【作法展示】 ①连接 ![]() ![]() ![]() ![]() ②以点 ![]() ![]() ![]() ![]() ![]() ③连接 ![]() ![]() ![]() ④作直线 ![]() ![]() ![]() ![]() 【原理说明】 证明:如图 ![]() ![]() 由作法可得, ![]() ![]() ∴ ![]() 又∵ ![]() ∴ ![]() ∴ ![]() 又∵点 ![]() ![]() ![]() ![]() 【总结反思】 对于较复杂的尺规作图可以按照如下步骤解决: ①先画草图;②借助草图,从结论出发,逆向探究,联想相关知识,思考作法;③利用尺规,按照作法,画出正确图形;④写出结论. 我们不仅要会作图还要知道为什么要这样作图,即实施这些步骤的理由是什么.并且从不同的知识出发可以得到不同的作法,例如本题还可以利用“直径所对的圆周角是直角”得到另一种作法. |
(1)上述材料【原理说明】中的依据是________;
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6c30cc8f47042602cfb51b72c00dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/e8aa383c-6f9d-4088-9506-dbfce370e6d2.png?resizew=143)
(3)请同学们根据小聪的【总结反思】尝试在图1中用尺规过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-作图题
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【推荐2】《几何原本》是一部集前人思想和欧几里得个人创造性一体的不朽之作,把人们公认的一些事实列成定义、公理和公设,用它们来研究各种几何图形的性质,从而建立了一套从定义、公理和公设出发,论证命题得到定理的几何学论证方法.小迪同学在学习过程中产生了一个猜想:“如果三角形一边上的中线的长度等于所在边长度的一半,那么这个三角形是直角三角形.”
![](https://img.xkw.com/dksih/QBM/2023/2/17/3176800629473280/3178017467211776/STEM/5acf6ae8ccca454689df2e838fb5994c.png?resizew=180)
(1)请你用尺规作图,在图中作出线段
的中点
,并连接
.(保留作图痕迹)
(2)请你结合图形,将小迪猜想的命题写成已知、求证.
已知:
求证:
为直角三角形.
(3)补全上述猜想的证明过程.
证明:∵点
是线段
的中点,
∴ ,
又∵
,
∴
,
在
中,∵
,
∴
,(___________)(填推理的依据),
同理,在
中, = .
在
中
∵
.
∴ +
,
∵在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d819045ab9ed2b42d3f6f13262464795.png)
∴在
中,
,
∴
为直角三角形.
![](https://img.xkw.com/dksih/QBM/2023/2/17/3176800629473280/3178017467211776/STEM/5acf6ae8ccca454689df2e838fb5994c.png?resizew=180)
(1)请你用尺规作图,在图中作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)请你结合图形,将小迪猜想的命题写成已知、求证.
已知:
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)补全上述猜想的证明过程.
证明:∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴ ,
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd72e399cbc9beead45a955482dd315.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928ce069fc1bd5c8a8592e1e3e9df5d3.png)
同理,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d398aab43c12b4418393d8f61300aba.png)
∴ +
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∵在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d819045ab9ed2b42d3f6f13262464795.png)
∴在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐1】如图,在
中,点
,
分别在
,
上,
.
是平行四边形.
(2)若
,
,
,点
为
的中点,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466a12cf2d11494ec4f7173e904932a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466a12cf2d11494ec4f7173e904932a9.png)
您最近一年使用:0次
解答题-问答题
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适中
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【推荐2】如图,在平面直角坐标系中,已知抛物线
(其中a、c为常数,且
)与x轴的一个交点为
,与y轴交于点B,此抛物线顶点C的纵坐标为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/abf522f8-e09a-4816-9119-6f3572fa7242.png?resizew=201)
(1)求抛物线的解析式;
(2)求
的正切值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9b0fcaa6deb9bac941a4366c44f7ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac9eb4f13a6ec140f7050e8d7dde52c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/abf522f8-e09a-4816-9119-6f3572fa7242.png?resizew=201)
(1)求抛物线的解析式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
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解答题-计算题
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适中
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【推荐3】在学完矩形的性质后,老师组织同学们利用矩形的折叠开展数学活动.小亮发现矩形折叠后,会出现全等的图形;小颖发现矩形折叠后会得到直角三角形,请利用同学们的发现解决下列问题.
(1)如图1,矩形
,
,
,将
延对角线
翻折得到
,点
的对应点为点
,
与
交于点
,则有
______,
,且
,易得
______;
(2)在(1)的条件下,若要求线段
的长度,令
,则
______ (用x表示),在
中利用勾股定理列出方程______(不用化简);
(3)如图2,对矩形
进行如下操作:①分别以点
,
为圆心,以大于
的长度为半径作弧,两弧相交于点
,
,作直线
交
于点
,连接
;②将
沿
翻折,点
的对应点落在点
处,作射线
交
于点
.若
,
,求线段CQ的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/07281884-0adb-4d7c-bebc-b1fd06c32b2f.png?resizew=355)
(1)如图1,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3caaf78d62215fcb4f0832075de9eef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e3835e0aa13c2b4ee92eb54d70afb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9574814ad707f5b4aaa60aa824115503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a63c2aaacc4c6de381bd6762d31706.png)
(2)在(1)的条件下,若要求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e787bb792dcd936cb4e87023c95011b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277d4fa62666459e91b0f16f3756c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ebc9a7a29f686f4288c70391897b07.png)
(3)如图2,对矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐1】如图,某公路上有一隧道,顶部是圆弧形拱顶,圆心为O,隧道的水平宽
为
,
离地面的高度
,拱顶最高处C离地面的高度
为
.若在拱顶的M,N处安装照明灯,且M,N离地面的高度相等,都为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/663cb7e9-8645-463a-9491-a039c78bef97.png?resizew=345)
(1)求圆弧形拱顶的半径的长度;
(2)求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74dee2e8849924124cbb31f9c6f15479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b523c9d2366145bcda7bb072ee5fc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36bcf194bcb1655d4e66af67af8e6a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/663cb7e9-8645-463a-9491-a039c78bef97.png?resizew=345)
(1)求圆弧形拱顶的半径的长度;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的外接圆,
为
的直径,点D是
的中点,连接
,作
的平分线交
于点E
;
(2)若过C点的切线与
的延长线交于点F,已知
,求
、线段
围成的阴影部分面积;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
(2)若过C点的切线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e211b30c682aa51030c25775964f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5db40c0ad940125cb88c967bb5a92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acb5e90dbcc3f3340916a3a11cc4612.png)
您最近一年使用:0次