问题背景:小李在探究几何图形的时候,发现了一组非常神奇的性质:如图1,等边三角形
中,连接
可以得到
,好学的他发问取
的中点,得到的
是特殊三角形吗?请说明理由;
迁移应用:如图2,在正方形
中,点O为
的中点,构造正方形
绕O点进行旋转,
,连接
,求
的值;
联系拓展:如图3,等腰
,
中,
,当
绕B点旋转的过程中取
的中点M,N,连接
,若
,且
时,直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b154b3f19a7c04ce039258c70203d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba83afe4ade6624b283331a18bdf2ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c5a0011c9af0c81b06e0b9b6dee3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba83afe4ade6624b283331a18bdf2ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
迁移应用:如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dd38e18b51f74ca2c54d20e4819689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6e33299be3b73bcbc2a6fc35f1ca6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f348e92926eb5568d1a9da7d58883a79.png)
联系拓展:如图3,等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5349182a187805a9c9ef7b7ef1eafb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e02f18c60eda544b42e4fff887fdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c785bce57b8ce113b28e8f16fc2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fb07165e4b08122704d4adcbce8c18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6196d02d2fbe595c1d7fca626b40b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
2023·广东深圳·三模 查看更多[2]
2023年广东省深圳市福田区上步中学中考三模数学试题(已下线)专题01锐角三角函数 (3个知识点5种题型1个易错点1种中考考法)-【帮课堂】2023-2024学年九年级数学下册同步学与练(北师大版)
更新时间:2023-11-06 16:53:29
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相似题推荐
解答题-问答题
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【推荐1】如图①,点A、B、C、D在同一条直线上,点O为直线外一点,连接
、
、
、
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8052651082b1215593dafbf10e72b837.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/5109ff90-c438-4243-bd67-0b691c191840.png?resizew=372)
(1)若
,
,
.
①求
的长度;
②旋转
,使C在
上,D在
的延长线上,如图②,若
,
,求m,n之间的关系;
(2)如图③,若
,点A在
延长线上时,且
,
,则
的长为______(请直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8052651082b1215593dafbf10e72b837.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/5109ff90-c438-4243-bd67-0b691c191840.png?resizew=372)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](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/15fcde639611cd140a6ffcd336bc5e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63fa985f668796640ee33c05f1110cc.png)
(2)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59559eb55b7480af0f0f5bbaa787d54c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解题方法
【推荐2】如图,在平面直角坐标系xOy中,把矩形COAB绕点C顺时针旋转α角,得到矩形CFED.设FC与AB交于点H,且A(0,4),C(8,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/899a26e8-f1ad-4a4d-9c92-793adb642dbb.png?resizew=174)
(1)当α=60°时,△CBD的形状是______;
(2)设AH=m
①连接HD,当△CHD的面积等于10时,求m的值;
②当0°<α<90°旋转过程中,连接OH,当△OHC为等腰三角形时,请直接写出m的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/899a26e8-f1ad-4a4d-9c92-793adb642dbb.png?resizew=174)
(1)当α=60°时,△CBD的形状是______;
(2)设AH=m
①连接HD,当△CHD的面积等于10时,求m的值;
②当0°<α<90°旋转过程中,连接OH,当△OHC为等腰三角形时,请直接写出m的值.
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名校
【推荐1】在菱形
中,
,点P是线段
上一动点,以
为边向右侧作等边三角形
,点E的位置随着点P的位置变化而变化.
内部或边上时,连接
,判断:
与
的数量关系是______.
与
的位置关系是______,并说明理由.
(2)若
,点Q为
的中点,则线段
长的范围是______.
(3)如图2,当点P在线段
的延长线上时,连接
,若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7e56107b5f2f34e420caffd1159b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
(3)如图2,当点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b636880623735373dc89aa54c51e5eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e078cd122af12cd6079b8bba40275235.png)
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解答题-证明题
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【推荐2】如图,将边长为4的正方形纸片ABCD折叠,使点A落在边CD上的点M处(不与点C、D重合),折痕EF分别交AD、BC于点E、F,边AB折叠后交边BC于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/7a938c21-6bfc-40e9-9270-10267b365876.png?resizew=152)
(1)若点M是边CD的中点,求△CMG的周长;
(2)若DM=
CD,求△CMG的周长;
(3)若M是边CD上的动点,
①你有什么猜想?证明你的猜想;
②四边形CDEF的面积S是否存在最值?若存在,求出这个最值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/7a938c21-6bfc-40e9-9270-10267b365876.png?resizew=152)
(1)若点M是边CD的中点,求△CMG的周长;
(2)若DM=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)若M是边CD上的动点,
①你有什么猜想?证明你的猜想;
②四边形CDEF的面积S是否存在最值?若存在,求出这个最值;若不存在,说明理由.
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【推荐1】已知:⊙O是
的外接圆,直径AB交CD于点E.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094101676032/2961583583887360/STEM/70e01e9bc9374136a12c91c5722c674b.png?resizew=150)
(1)如图1,求证:
;
(2)如图2,过点D作
于点G,交⊙O于点F,连接BF,若DC平分∠ADF,求证:
;
(3)如图3,在(2)的条件下,过点E作
交DG于点K,在BF上取一点N,连接KN、GN,使
,若
,
,求线段GN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094101676032/2961583583887360/STEM/6b26b482bda44a4ca4c254fdb0345490.png?resizew=157)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094101676032/2961583583887360/STEM/3b1159a619834d7ab6c93b9ad250c7ad.png?resizew=147)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094101676032/2961583583887360/STEM/70e01e9bc9374136a12c91c5722c674b.png?resizew=150)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267052fcff3f7e36146d7c57957bb719.png)
(2)如图2,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
(3)如图3,在(2)的条件下,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c254807414bff18fcd901a3be7949e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0391c5aa64627894a1c4a20f3ee38b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f835391df1736f9f866835374b0ad6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2f4b6bd31120b52d580e7a16abe9a1.png)
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【推荐2】在三角形纸片
中,点M为
上一点,直线
过点M.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958152986992640/2962071086292992/STEM/661c6305-1d03-46b2-ad78-69cbd0c4fde4.png?resizew=615)
(1)如图1,若
,将
沿直线
折叠,使点B与点C重合,折痕为
,则
______;
(2)如图2,若
,
,将
沿直线
折叠,使点B与点C重合,折痕为
,求
的值;
(3)如图3,若
,
,
,直线
过顶点C,将
沿直线
折叠,使点B落在边
上的点
处,折痕为
.
①求线段
的长;
②若点O是边
的中点,点P为线段
上的一个动点,将
沿
折叠得到
,点A的对应点为点
,
与
交于点F,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958152986992640/2962071086292992/STEM/661c6305-1d03-46b2-ad78-69cbd0c4fde4.png?resizew=615)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b58afe265c5a55277feb3fb385e379.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3c5d2cbe5cfa47fde68ff3b5b81469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7b4f3963adfc61fcd77a213f08d68b.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d6929baa76a9dd07f5bdcfc518987f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
①求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②若点O是边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17cf8e6bfbe3b365f8e9278cc469d2b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b26de6134b6d3f5a81e2882a7d7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c2a13ae01a4259107f8ba176fd56c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42198b8e646ccfbbec323fd364c4d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85617d27e16fbf5549964b0d7caa1d4e.png)
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解题方法
【推荐1】如图,在
中,
,
是
边上的高,点
是
的中点,点
从点
出发,以每秒1个单位长度的速度沿折线
向终点
运动,连结
,作点
关于直线
的对称点
,设点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/72061762-aa9e-4b6b-8488-7baa6e98df64.png?resizew=315)
(1)线段
的长为_______;
(2)用含
的代数式表示点
到
的距离
;
(3)连结
,当线段
最长时,求
的面积;
(4)当点
三点共线时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56107a0a6ead9f361f56b5620ac6dd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155dcefd960d6375757c0068dbf3b577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/72061762-aa9e-4b6b-8488-7baa6e98df64.png?resizew=315)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172f1b400d9ddec4ea01f6fd040b3802.png)
(4)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d617d43a227b7f906e1b0337e04046fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】对于平面直角坐标系
中的线段
,给出如下定义:若存在
使得
,则称
为线段
的“等幂三角形”,点R称为线段
的“等幂点”.
(1)已知
.
①在点
中,是线段
的“等幂点”的是_____________;
②若存在等腰
是线段
的“等幂三角形”,求点B的坐标;
(2)已知点C的坐标为
,点D在直线
上,记图形M为以点
为圆心,2为半径的
位于x轴上方的部分,若图形M上存在点E,使得线段
的“等幂三角形”
为锐角三角形,直接写出点D的横坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47214e2e943e3f0794df735f293a132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2b1f4120365cb6ee4925fe417563f9.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03817ce7132d153093f456ef472912a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②若存在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)已知点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb50e3bcc32431251722d9390f44da2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e235d7dd12f948f5ffb2e5afddc95612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8dccf8aa38f2f1d6c4c337d9758aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d6ab4479fca30268660739ec6852c3.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】问题发现:
(1)如图1,
内接于半径为4的
,若
,则
_______;
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394802730754048/2395859633815552/STEM/cda17f78d6e9493abe065e0d97ca2dc0.png?resizew=382)
问题探究:
(2)如图2,四边形
内接于半径为6的
,若
,求四边形
的面积最大值;
解决问题
(3)如图3,一块空地由三条直路(线段
、AB、
)和一条弧形道路
围成,点
是
道路上的一个地铁站口,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9b5aa6e00dabe7bddf1f2a570e0b8f.png)
千米,
千米,
,
的半径为1千米,市政府准备将这块空地规划为一个公园,主入口在点
处,另外三个入口分别在点
、
、
处,其中点
在
上,并在公园中修四条慢跑道,即图中的线段
、
、
、
,是否存在一种规划方案,使得四条慢跑道总长度(即四边形
的周长)最大?若存在,求其最大值;若不存在,说明理由.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394802730754048/2395859633815552/STEM/cda17f78d6e9493abe065e0d97ca2dc0.png?resizew=382)
问题探究:
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ba2098ed6b4137b08932524b72ba37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
解决问题
(3)如图3,一块空地由三条直路(线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9b5aa6e00dabe7bddf1f2a570e0b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90bae886c8ab958aa4c693bf8e0627d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4dcdc159b6558c112270ba07a08286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6b2dcfd1fe3e7de1f11a3f08810337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ae677e35bd19e7eabf36706f2dcfda.png)
您最近一年使用:0次