四边形
为平行四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/acf0ecbc-1bbb-4160-aec9-73b277ffe26f.jpg?resizew=489)
(1)将平行四边形
沿对角线
翻折,点A落在点
处,连接
,
.
①如图1,延长
、
于点E,求证:
;
②如图2,若
,
交
于M,N为
上一点,直线
交
于P,满足
,试猜想
的值,并说明理由;
(2)如图3,点E是
边上的动点,己知
,现
,现将
沿
折叠,点
点是B的对应点,设
长为
,若点
落在
内(包括边界),直接写出
的取值范围为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/acf0ecbc-1bbb-4160-aec9-73b277ffe26f.jpg?resizew=489)
(1)将平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
①如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d9b69c9ccad8a244fc464ae70d93f7.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e996453aadd3ab2e0654c6f34aa817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9970ffead72bfa501cd0fce8918dec63.png)
(2)如图3,点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86422c276c537c810d243fbced9940d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2023-10-28 16:12:41
|
相似题推荐
解答题-证明题
|
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(0.4)
【推荐1】如图,在
中,
的平分线交
于点E,以A为圆心,
为半径作
交
于点F,直线
交
于G、H两点,
的延长线交
于点D,作
,垂足为点K.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/e21855b8-61cb-461e-8e92-9b24b3f325ef.png?resizew=203)
(1)求证:
;
(2)求证:
;
(3)当
且
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117981f87d30073ff1f0a3890235a3b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/e21855b8-61cb-461e-8e92-9b24b3f325ef.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33530f6f06cb219d600f93fb2c92de0.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f792acf7146c265b0fa8ff01a8bff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd3a1d593b9cd662576d81a774f9114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4b34b13c48918c7ee7af31b45375da.png)
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【推荐2】已知正方形ABCD,一等腰直角三角板的一个锐角顶点与A重合,将此三角板绕A点旋转时,两边分别交直线BC、CD于M、N.
(1)当M、N分别在边BC、CD上时(如图1),求证:BM+DN=MN;
(2)当M、N分别在边BC、CD所在的直线上时(如图2),线段BM、DN、MN之间又有怎样的数量关系,请直接写出结论 ;(不用证明)
(3)当M、N分别在边BC、CD所在的直线上时(如图3),线段BM、DN、MN之间又有怎样的数量关系,请写出结论并写出证明过程.
(1)当M、N分别在边BC、CD上时(如图1),求证:BM+DN=MN;
(2)当M、N分别在边BC、CD所在的直线上时(如图2),线段BM、DN、MN之间又有怎样的数量关系,请直接写出结论 ;(不用证明)
(3)当M、N分别在边BC、CD所在的直线上时(如图3),线段BM、DN、MN之间又有怎样的数量关系,请写出结论并写出证明过程.
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465569792/STEM/c680429e12af44379dcafd4c6b857ffa.png?resizew=396)
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名校
【推荐1】如图,在△ABC中,AB=AC=4,∠B=∠C=50°,点D在线段BC上运动(D不与B,C重合),连接AD,作∠ADE=50°,DE交线段AC于E.
(1)当∠BDA=120°时,∠EDC_____;点D从B向C运动时,∠BDA逐渐变_____(填“大”或“小”);
(2)当DC等于多少时,△ABD≌△DCE,请说明理由;
(3)在点D的运动过程中,△ADE的形状可以是等腰三角形吗?若可以,请直接写出∠BDA的度数,若不可以,请说明理由.
(1)当∠BDA=120°时,∠EDC_____;点D从B向C运动时,∠BDA逐渐变_____(填“大”或“小”);
(2)当DC等于多少时,△ABD≌△DCE,请说明理由;
(3)在点D的运动过程中,△ADE的形状可以是等腰三角形吗?若可以,请直接写出∠BDA的度数,若不可以,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570198185009152/2570707595919360/STEM/a529e2baed6e41e782a1a29d5935bbc0.png?resizew=368)
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【推荐2】在
中,
为
的角平分线,点E是直线
上的动点.
(1)如图所示,若点E恰好是
边的中点,过点E作
延长线的垂线,垂足为点G,交
于点F,交
的延长线于点H.求证:
;
(2)若
,
,且满足
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/def5feb1-d8dd-4fc0-aec8-dfb7421dc103.png?resizew=205)
(1)如图所示,若点E恰好是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5165287f10a2f34d5c251e846d627e38.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122e177c4d664591370491c2113ca765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caed943cdb2525229da8a68d00c19337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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【推荐1】如图,ABCD是一张矩形纸片,AD=BC=2,AB=CD=10,在矩形ABCD的边AB上取一点M,在CD上取一点N,将纸片沿MN折叠,使MB与DN交于点K,得到△MNK.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1573981309632512/1573981316177920/STEM/49e1d261efca48e9a6b888fcbe6bbeba.png)
(1)若∠1=70°,求∠MKN的度数;
(2)当折痕MN与对角线AC重合时,试求△MNK的面积;
(3)△MNK的面积能否小于2?若能,求出此时∠1的度数;若不能,试说明理由.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1573981309632512/1573981316177920/STEM/49e1d261efca48e9a6b888fcbe6bbeba.png)
(1)若∠1=70°,求∠MKN的度数;
(2)当折痕MN与对角线AC重合时,试求△MNK的面积;
(3)△MNK的面积能否小于2?若能,求出此时∠1的度数;若不能,试说明理由.
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【推荐2】将一个等腰直角三角形纸片
放置在平面直角坐标系中,点
,点
,点
在第一象限,
,
,点
在边
上(点
不与点
,
重合).
![](https://img.xkw.com/dksih/QBM/2022/5/21/2984001764270080/2985558520397824/STEM/b0c1fdd0-8ce3-4a27-bfd2-61bf02f19ed8.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2022/5/21/2984001764270080/2985558520397824/STEM/eb41be8b-daa6-4f81-b22c-db6eb345110c.png?resizew=143)
(1)如图①,当
时,求点
的坐标;
(2)折叠该纸片,使折痕所在的直线经过点
,并垂直于
轴的正半轴,垂足为
,点
的对应点为
,设
.
①如图②,若折叠后
与
重叠部分为四边形,
与边
相交于点
,试用含有
的式子表示四边形
的面积
,并直接写出
的取值范围;
②若折叠后
与
重叠部分的面积为
,当
时,求
的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1a9821a00b71f6b7d7a76d91b3f810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2b1f4120365cb6ee4925fe417563f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ec371d5dbc19d236bf8a1f084031e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09cf17ee13e937cd8b84879da17d15b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/21/2984001764270080/2985558520397824/STEM/b0c1fdd0-8ce3-4a27-bfd2-61bf02f19ed8.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2022/5/21/2984001764270080/2985558520397824/STEM/eb41be8b-daa6-4f81-b22c-db6eb345110c.png?resizew=143)
图① 图②
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07445aa3909818a3ef93bb01182f545f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)折叠该纸片,使折痕所在的直线经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8070045849428341cc37653339f3713.png)
①如图②,若折叠后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f67c9cb1cbb2579e6196fcfe76c5203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41327aab1b961943b92e8fa5e9747386.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100bb28abda3a65c2a61fa6db2e3f8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②若折叠后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f67c9cb1cbb2579e6196fcfe76c5203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8077eb3dcedb8f0ee6f3ac54d00cff96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐1】综合与实践
【问题情境】在综合与实践课上,老师让同学们以“矩形纸片的剪拼”为主题开展数学活动.
如图1,将矩形纸片
沿对角线
剪开,得到
和
,并且量得
.
【操作发现】
(1)将图1中的
以点A为旋转中心,按逆时针方向旋转
,使
,得到如图2所示的
,过点C作
的平行线,与
的延长线交于点E,请你判断四边形
的形状,并证明你的结论.
(2)创新小组将图1中的
以点
为旋转中心,按逆时针方向旋转,使
三点在同一条直线上,得到如图3所示的
,连接
,取
的中点F,连接
并延长至点G,使
,连接
,得到四边形
,请你判断四边形
的形状,并证明你的结论.
【实践探究】
(3)缜密小组在创新小组发现结论的基础上,进行如下操作:将
沿着
方向平移,使点B与点A重合,此时A点平移至A′点,
与
相交于点H,如图4所示,连接
,直接写出线段
的长度.
【问题情境】在综合与实践课上,老师让同学们以“矩形纸片的剪拼”为主题开展数学活动.
如图1,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fea9981fb17ea551b1392db2ed237a.png)
【操作发现】
(1)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7617d1a473218e9bcab441b2dad8e0df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efbefecd3366c5a1562e9e54499d6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288abe01824f42cfe725509af5aec4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fa24e6e1e467f6964bfd663d83d1f3.png)
(2)创新小组将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b406a657142e2a333d3eb73a1259fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efbefecd3366c5a1562e9e54499d6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd93ad139410a0bc761cce65c84f599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c669be0e3706f11b6e7f94bb7510e53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087c4fbe1afd182315c6cb6b0fc62f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cee0a5a48b32cca89b8e237a5a0515f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cee0a5a48b32cca89b8e237a5a0515f.png)
【实践探究】
(3)缜密小组在创新小组发现结论的基础上,进行如下操作:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17288da70b31823293794cb289e3123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db94ea06ef27a92107d4bb70a404a826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd93ad139410a0bc761cce65c84f599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3232872123134c78f0c9f9587564a564.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】在平面直角坐标系中,点Q为坐标系上任意一点,某图形上的所有点在∠Q的内部(含角的边),这时我们把∠Q的最小角叫做该图形的视角.如图1,矩形ABCD,作射线OA,OB,则称∠AOB为矩形ABCD的视角.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/8192b983-4c6f-4a83-8098-85ff5843f87d.png?resizew=549)
(1)如图1,矩形ABCD,A(﹣
,1),B(
,1),C(
,3),D(﹣
,3),直接写出视角∠AOB的度数;
(2)在(1)的条件下,在射线CB上有一点Q,使得矩形ABCD的视角∠AQB=60°,求点Q的坐标;
(3)如图2,⊙P的半径为1,点P(1,
),点Q在x轴上,且⊙P的视角∠EQF的度数大于60°,若Q(a,0),求a的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/8192b983-4c6f-4a83-8098-85ff5843f87d.png?resizew=549)
(1)如图1,矩形ABCD,A(﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)在(1)的条件下,在射线CB上有一点Q,使得矩形ABCD的视角∠AQB=60°,求点Q的坐标;
(3)如图2,⊙P的半径为1,点P(1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次