定义:如图1,射线
在
的内部,图中共有3个角:
和
,若其中有一个角的度数是另一个角度数的两倍,则称射线
是
的“妙分线”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/12cfd5a7-ecec-481b-90b3-d1f831a2754e.png?resizew=274)
(1)如图1,若
,且射线
是
的“妙分线”,求
的度数.
(2)如图2,若
,射线
绕点P从
位置开始,以每秒
的速度顺时针旋转,同时,射线
绕点
以每秒
的速度顺时针旋转,当
与
成
时,射线
,射线
同时停止旋转,设旋转的时间为
秒,求
为何值时,射线
是
的“妙分线”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29cd961a2e521fc3fbfb7ded70b176f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/12cfd5a7-ecec-481b-90b3-d1f831a2754e.png?resizew=274)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e0eca7da89ba07877ec3d1cb33e138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933832c45503df7c8617c904853bdb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b4acddf579a77ac63e095936fe66c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
更新时间:2024-01-16 19:18:25
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】平面直角坐标系中,已知点
.
(1)若点
在
轴上,求
的值;
(2)若点
在第二、第四象限的角平分线上,求点
的坐标;
(3)在同一平面直角坐标系中,点
,且
轴,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997a5d5faafd66a9b355e804e55e7f76.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在同一平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577f34450607debe6186e7e1c523e43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5667cab08836ef9463574ea55bb04c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图(1),在
中,
,
,
,
,现有一动点
,从点
出发,沿着三角形的边
运动,回到点
停止,速度为
,设运动时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/a3535608-41f2-4eee-86ca-c3fecbb517c0.png?resizew=262)
(1)如图(1),当
________时,
的面积等于
面积的一半:
(2)如图(2),在
中,
,
,
,
.在
的边上,若另外有一个动点
,与点
同时从点
出发,沿着边
运动,回到点
停止.在两点运动过程中的某一时刻,恰好
全等于
,求点
的运动速度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.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/87cc6936185801c3d48de0e6f43af598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/a3535608-41f2-4eee-86ca-c3fecbb517c0.png?resizew=262)
(1)如图(1),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图(2),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fb7cc752222306029fabbeb894a800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c750cbbbe03c2d4fb2b4ea84f659631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d84d854912b3a30f3754401a31e8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd1059083619174636f2c2792948ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/41abb6179049bc470566d67e7d1819d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】请阅读下列材料,并完成相应的任务.
已知“三角形的一个外角等于与它不相邻的两个内角的和”,那么五边形的外角与内角之间又有什么关系呢?
中,
是它的两个外角,则
.下面是该结论的证明过程(部分):
∵五边形的内角和为
,
∴
.
……
(1)按照上面的证明思路,完成证明的剩余部分.
(2)知识应用:如图2,在五边形
中,
分别是
和
的平分线,若
,求
的度数;
(3)拓展提升:如图3,
,
,则
_______.
已知“三角形的一个外角等于与它不相邻的两个内角的和”,那么五边形的外角与内角之间又有什么关系呢?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497b955fd8c7d39a388ed329624d9bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b02be771f34dc98f6093dfd8a87fd3d.png)
∵五边形的内角和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe63970dd232124dd35bf6abe347de40.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f8cd629bf2380454145e577a1d18f.png)
……
(1)按照上面的证明思路,完成证明的剩余部分.
(2)知识应用:如图2,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb8807c9f6d564ca4d09ea60638fd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4c7550e43c1bf7b1b685c38aa84a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a1c4401de116d394ea1aba543d036e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3d36222090d3246ccde77efecd4263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
(3)拓展提升:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c360f46f22c3dca8fbd58725bd2620c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771de7ac1dad1b5058ad2ae243b15067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7960538cb70fcf641b94864a90190d.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图①,已知线段
,
,线段
在线段
上运动,E,F分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/a4c21297-688f-4dda-be10-46e448604a9a.png?resizew=502)
(1)若
,则
___________cm;
(2)我们发现角的很多规律和线段一样,如图②,已知
在
内部转动,
,
分别平分
和
,若
,
,则
___________.直接写出
,
和
的数量关系:___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e62cc0976694a0a3797a63a1fc7d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff211cc2d3e8bbf58a852f61416393c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/a4c21297-688f-4dda-be10-46e448604a9a.png?resizew=502)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b856c3762dfc9c5efa5d18361d3702d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
(2)我们发现角的很多规律和线段一样,如图②,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fd5e8829ef6234d057c398b7eafc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db47225f55b47c29803c4a03b98c0714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,已知射线
在
的内部,若
,
和
三个角中有一个角的度数是另一个角度数的两倍,则称射线
是
的奇妙线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/d6de33cb-1938-48b3-bdc7-50101e5e116b.png?resizew=210)
(1)一个角的平分线________这个角的奇妙线;(填“是”或“不是”)
(2)如图2,
.
①若射线
是
的奇妙线,则
的度数为________;
②若射线
从
位置开始,以每秒旋转
的速度绕点
按逆时针方向旋转,当
首次等于
时停止旋转,设旋转的时间为
.当
为何值时,射线
是
的奇妙线?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/d6de33cb-1938-48b3-bdc7-50101e5e116b.png?resizew=210)
(1)一个角的平分线________这个角的奇妙线;(填“是”或“不是”)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
①若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958e7abd79a73e20a4629233d7b42e4a.png)
②若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46e2aafc96cbd4616f9bf6499f80fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46e2aafc96cbd4616f9bf6499f80fd1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知
=
,
、
是过点
的射线,射线
、
分别平分
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/6d3ffdd7-5c05-427c-a213-49ff3d61f03e.png?resizew=476)
(1)如图①,若
、
是
的三等分线,求
的度数;
(2)如图②,若
=
,
,则
=________;
(3)如图③,在
内,若
=
,则
=________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea7b811fa609b8e92da877471564e07.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/6d3ffdd7-5c05-427c-a213-49ff3d61f03e.png?resizew=476)
(1)如图①,若
![](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/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315ac819ee85f23ee729d927b44bed1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65f1bf6f95db4efdd8209008c9cc2a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce419138c9956049768d27a5a61c956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
您最近一年使用:0次