如图,
.
(1)求证:
;
(2)若
平分
,求
的度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fee105240036da775c8429f75c3c79.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/22/b1a28f51-1236-4a40-8978-b8de2617bf15.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35b50d6847abe193fc2c8e89ff89e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46136e1230ce514e8aca50e9807c2b19.png)
更新时间:2023-05-11 09:33:26
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在△ABC中,AD,AF分别为△ABC的中线和高,BE为△ABD的角平分线.
(2)若△ABC的面积为40,BD=5,求AF的长.
(2)若△ABC的面积为40,BD=5,求AF的长.
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解答题-问答题
|
适中
(0.65)
【推荐2】已知
是一个直角,作射线
,再分别作
和
的平分线
,
.
(1)如图1,当
时,求
的度数;
(2)如图2,当射线
在
内绕
点旋转时,
始终是
与
的平分线.则
的大小是否发生变化,说明理由;
(3)当射线
在
外绕
点旋转且
为钝角时,
仍始终是
与
的平分线,直接写出
的度数(不必写过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)如图2,当射线
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92574df7bd90ee17a4834a608e0179e8.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/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(3)当射线
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92574df7bd90ee17a4834a608e0179e8.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/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/2020/2/22/2404706771623936/2405340301533184/STEM/28fe4db8-eb3a-4ec6-b095-1ac86eacf9a2.png?resizew=368)
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解答题-问答题
|
适中
(0.65)
【推荐3】如图1,在直线
上摆放一副直角三角板,两三角板顶点重合于点
,
,
,将三角板
绕点
以每秒
的速度顺时针方向转动,设转动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/9856bd92-5e6e-4632-bec6-250d8f5ada61.png?resizew=617)
(1)如图2,若
平分
,则
的最小值为______;此时
______度;(直接写答案)
(2)当三角板
转动如图3的位置,此时
、
同时在直线
的右侧,猜想
与
有怎样的数量关系?并说明理由;(数量关系中不含
)
(3)若当三角板
开始转动的同时,另一个三角板
也绕点
以每秒
的速度顺时针转动,当
旋转至射线
上时,两三角板同时停止运动:
①当
为何值时,
;
②在转动过程中,请写出
与
的数量关系,并说明理由.(数量关系中不含
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c9450b913de32261a2706d9031342b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/9856bd92-5e6e-4632-bec6-250d8f5ada61.png?resizew=617)
(1)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77603496a315e39db671c0c1e4256cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e463e9632334793169f4f0214155ed.png)
(2)当三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea7b811fa609b8e92da877471564e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd0dc942dc5a587e3c638df0d42c76b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若当三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213ab5d892e65460436e53298de48cbe.png)
②在转动过程中,请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea7b811fa609b8e92da877471564e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd0dc942dc5a587e3c638df0d42c76b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图1,点
在CA的延长线上,DE,AB交于点F,且
,
.
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675595233140736/1677597378863104/STEM/d242fcec9403411bbab7d6e5606be3ad.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675595233140736/1677597378863104/STEM/683e587675ed4f51a98be36f01747507.png?resizew=145)
(1)判断AB与CD的位置关系,并证明.
(2)如图2,
,
的角平分线交于点G,若
的补角比
的余角小10°,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5f4b1f0e511aca4626ae846fd31f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675595233140736/1677597378863104/STEM/d242fcec9403411bbab7d6e5606be3ad.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675595233140736/1677597378863104/STEM/683e587675ed4f51a98be36f01747507.png?resizew=145)
(1)判断AB与CD的位置关系,并证明.
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384da7acfefa7c656eaca2df173f0cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3909f220cf6bd065e382e263b77aa22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f7e1c0456e86eee4f22e913a1a5778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0a272aa29c4531aac22f28c64baf5.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,AB∥CD,∠B=76°,∠F=30°,求∠D的度数.
![](https://img.xkw.com/dksih/QBM/2015/3/3/1573805020880896/1573805026811904/STEM/2e45f1f6e59545acb9db10a2a561c056.png)
您最近一年使用:0次