如图是某小型汽车的侧面示意图,其中矩形ABCD表示该车的后备箱,在打开后备箱的过程中,箱盖ADE可以绕点A逆时针方向旋转,当旋转角是50度时,箱盖落在
的位置(如图2),已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c05b92f988e20bd27fa9d46116f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d469c3c6609a101a193f0457c8d87dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fa64eeffab4d079d0f85c84736f667.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501334944628736/2503067233148928/STEM/21e4c0554a254679a13ca5f4a445de22.png?resizew=242)
(1)求点
到
的距离;(结果保留整数)
(2)求
两点之间的距离.(结果保留整数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975b5c41d07d984262066018c4dba19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c05b92f988e20bd27fa9d46116f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d469c3c6609a101a193f0457c8d87dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fa64eeffab4d079d0f85c84736f667.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501334944628736/2503067233148928/STEM/21e4c0554a254679a13ca5f4a445de22.png?resizew=242)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb31e4030f8e14d6774f3002ee110450.png)
更新时间:2020-07-10 20:46:14
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【推荐1】如图,在正方形ABCD的外侧,作等边三角形ADE,连接BE,CE.
(1)求证:BE=CE.(2)求∠BEC的度数.
(1)求证:BE=CE.(2)求∠BEC的度数.
![](https://img.xkw.com/dksih/QBM/2018/6/29/1977762634498048/1979308312428544/STEM/df9ff65dd3a145a99004a56ae4f337b4.png?resizew=217)
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【推荐2】菱形
中,
,点
在边
上,点
在边
上.
(1)如图1,若
是
的中点,
,求证:
是
的中点;
(2)如图2,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2b3f06d7405250f14bf75b7668686e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d05b0740d6f6e78e3477447f6104b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53a92b465cdbfa308a8bd5e35d2bd27.png)
![](https://img.xkw.com/dksih/QBM/2020/5/11/2460666314899456/2461199185354752/STEM/83b4d218ef83448ba500accedf0622de.png?resizew=357)
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【推荐1】如图,在
中,
,
为
的中线,过点
作
于点
,过点
作
的平行线,交
的延长线于点
,在
的延长线上截取
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485453200572416/2491766244696064/STEM/36f630eb-5afa-4ef6-bbb6-2f23fa15b510.png?resizew=255)
(1)求证:
;
(2)求证:四边形
为菱形;
(3)若
,
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0d5553e822b79c579ceb9fd2a90eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485453200572416/2491766244696064/STEM/36f630eb-5afa-4ef6-bbb6-2f23fa15b510.png?resizew=255)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b9f98fe35d1baada6fa249d117363e.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7705bd7b3c10df2fa0cab1fff4074c2e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c8d9f6bfa71b60c6dc9afe674a3214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7705bd7b3c10df2fa0cab1fff4074c2e.png)
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【推荐2】综合与实践
勾股定理是人类最伟大的十个科学发现之一,西方国家称之为毕达哥拉斯定理.在我国古书《周髀算经》中就有“若勾三,股四,则弦五”的记载,我国汉代数学家赵爽为了证明勾股定理,创制了一幅“弦图”(如图1),后人称之为“赵爽弦图”,流传至今.如图2,直角三角形的两条直角边分别为a,b,斜边为c.
(1)如图3,以直角三角形的三边a,b,c为边,分别向外部作正方形,直接写出
,
,
满足的关系: .
(2)如图4,以
的三边为直径,分别向外部作半圆,请判断
,
,
的关系并证明.
(3)如图5,将这四个直角三角形紧密地拼接,形成飞镖状,已知外围轮廓(实线)的周长为
,
,直接写出该飞镖状图案的面积.
勾股定理是人类最伟大的十个科学发现之一,西方国家称之为毕达哥拉斯定理.在我国古书《周髀算经》中就有“若勾三,股四,则弦五”的记载,我国汉代数学家赵爽为了证明勾股定理,创制了一幅“弦图”(如图1),后人称之为“赵爽弦图”,流传至今.如图2,直角三角形的两条直角边分别为a,b,斜边为c.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/2364011b-69ca-4561-b5b7-a292d1cb4722.png?resizew=502)
(1)如图3,以直角三角形的三边a,b,c为边,分别向外部作正方形,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
(2)如图4,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
(3)如图5,将这四个直角三角形紧密地拼接,形成飞镖状,已知外围轮廓(实线)的周长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42f56b246c0eecf454c6ca8f956fb04.png)
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【推荐1】如图,矩形ABCD的对角线AC、BD交于点O,∠AOB=60°,AB=3,求BD的长.
![](https://img.xkw.com/dksih/QBM/2015/9/11/1573911438721024/1573911444750336/STEM/6897b64e257c484d85de785c0190fc7c.png)
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【推荐2】如图,已知四边形
为矩形,且B点坐标为
,反比例函数
的图象与矩形交于D点和E点,且
,连接
.
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e3fa43e765646223675ef9bbd6d2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16711ffd0a06bb5821d67fe1f6286a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15510729f874261e12f231e307d7353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】如图,在平面直角坐标系中,一次函数
与反比例函数
且
交于
、
两点,与
轴、
轴分别交于
、
两点,连接
、
若
;
,点
的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a3089bf1c569adbaaad9f51ebf7a40.png)
(2)连接
,若点
是
轴上一点,且
是以
为腰的等腰三角形,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e9221dc8db87d61fecc7c8d725f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf624aa67772132098b452733bdf0ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4537d9e869e5bba2d7dcc683a0f73e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0b14809d0e561b38d6b8b835f2b1a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8e32c3d70a8798104eee85ae3879e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de47fe2b4ecef8abfbd319a36d372d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a3089bf1c569adbaaad9f51ebf7a40.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3877c5dd48bc7311f79a38de74a6cab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图,在4×4的方格中,点A,B,C都在格点上
(1)tanB的值是______.
(2)在格点上确定点D,使得四边形ABCD至少有一组对角相等.(要求画出点的三种不同位置)
(1)tanB的值是______.
(2)在格点上确定点D,使得四边形ABCD至少有一组对角相等.(要求画出点的三种不同位置)
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209918333313024/2212808950513664/STEM/f7fd298cca9c4909bf4dddbdf2f1112b.png?resizew=346)
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