请你结合题意,分别画出示意图,并完成解答:
(1)在
中,若
,若
,
,求
的长;
(2)在
中,
,
,求
的正弦.
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf9ecf107ac5de213535652016519f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
更新时间:2024-01-12 16:28:29
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解答题-作图题
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适中
(0.65)
【推荐1】图,已知弓形的弦长
,
,D为AB中点,
.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2977926783770624/2981606140248064/STEM/214b3b0d-507f-47d5-b15d-d4347c7d9bda.png?resizew=260)
(1)请利用尺规作图的方法找到圆心
;
(2)求弓形所在
的半径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/2022/5/4/2977926783770624/2981606140248064/STEM/214b3b0d-507f-47d5-b15d-d4347c7d9bda.png?resizew=260)
(1)请利用尺规作图的方法找到圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)求弓形所在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
|
适中
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【推荐2】如图,直线
与x轴交于点D,直线
与x轴交于点A,且经过定点
,直线
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/702e96d3-6e88-4587-ab09-00acc0b7ef84.png?resizew=158)
(1)求k、b和m的值;
(2)求
的面积;
(3)若动点P在线段
上从点D开始以每秒1个单位的速度向点A运动,点P到达点A停止运动,设点P的运动时间为t秒.是否存在t的值,使
为等腰三角形?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11597efacecb5d9017da39f77406b7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb8ba8e8edf6c103dd68511dd5c9a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18bf37fd17717a128b123595b845694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9316f8a58f503d0ea3879b8be30eaae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/702e96d3-6e88-4587-ab09-00acc0b7ef84.png?resizew=158)
(1)求k、b和m的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
(3)若动点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
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解答题-问答题
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适中
(0.65)
【推荐1】综合与实践
如下图,在边长为1的正方形网格中,连接格点
、
和
、
,
和
相交于点
,求
的值.
方法归纳:求一个锐角的三角函数值,我们往往需要找出(或构造出)一个直角三角形.观察发现问题中
不在直角三角形中,我们常常利用网格画平行线等方法解决此类问题,比如连接格点
,
,可得
,则
,连接
,那么
就变换到
中.
(1)上图中
______;
(2)如下图,
,
,
,
四点均在边长为1的正方形网格的格点上,
与
相交于点
,求
的值.
(3)如下图,
,
,
,
,
五点均在边长为1的正方形网格的格点上,
交
的延长线于点
,求
的值.
如下图,在边长为1的正方形网格中,连接格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae8d7460b99722ad5f8f15aab09c2fa.png)
方法归纳:求一个锐角的三角函数值,我们往往需要找出(或构造出)一个直角三角形.观察发现问题中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b91ef5ffdba260ce27659dce5c4ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138ce47ba6356ac3feafdda290bc544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf8f34823528fdad222755e8351526a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b91ef5ffdba260ce27659dce5c4ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf2ab7668ce5e360663a2b7c387fa8b.png)
(1)上图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a8d92bca9eaa910d80a92cd6426897.png)
(2)如下图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead194894742c35d69d5f85b7228e768.png)
(3)如下图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f3c1987424599ba33c84599febf556.png)
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解答题-问答题
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【推荐2】如图,一次函数
的图象与反比例函数
的图象交于
,B两点,与坐标轴交于C,D两点,连接OB.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/4b6ca356-d1cd-4082-8fa7-428ccb6b8512.png?resizew=173)
(1)求反比例函数的表达式,
(2)连接OA,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca621dc42304f844ac15dad7062d3959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212e728b36c078188606c9d429389d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5343f6dee6d12906b09ff03166350a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/4b6ca356-d1cd-4082-8fa7-428ccb6b8512.png?resizew=173)
(1)求反比例函数的表达式,
(2)连接OA,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d432786fb9bbc9791f7e1eb06c5e91fa.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图1,在平行四边形
中,
的平分线与
边相交于点E,
,
![](https://img.xkw.com/dksih/QBM/2023/5/7/3232361920225280/3234909417029632/STEM/59e8b611f80646819db537004496eced.png?resizew=464)
(1)求:
.
(2)如图2,连结
并延长,与
延长线相交于点F,求证
.
(3)在(2)条件下,
连结
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://img.xkw.com/dksih/QBM/2023/5/7/3232361920225280/3234909417029632/STEM/59e8b611f80646819db537004496eced.png?resizew=464)
(1)求:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7011c4f2318bafeba10e4c46901062.png)
(2)如图2,连结
![](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/62a90242b631fb848ebf24804c4d19a9.png)
(3)在(2)条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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名校
【推荐2】如图,四边形ABCD内接于⊙O,AB是直径,C为
的中点,延长AD,BC交于P,连结AC.
(1)求证:AB=AP;
(2)当AB=10,DP=2时,求线段CP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
(1)求证:AB=AP;
(2)当AB=10,DP=2时,求线段CP的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/9779f05c-24e2-4b3f-986a-9734358181c4.png?resizew=138)
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