把一副三角板
和
按照图1~图3的方式放置,使
中的
角的顶点B和直角顶点C分别在含有
角的
的两条直角边上.
(1)如图1,若
,点E在
的内部,则
______
,
______
,
______
.
(2)如图2,若
与
不平行,点E在
的内部,求
满足的数量关系.
(3)如图3,若
与
不平行,点E在
的外部,(2)中所求的结论是否仍然成立?若成立,请给予证明;若不成立,请写出正确结论(用等式表示),并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/c3988a1c-09f5-49d5-b548-5e1d199b7e73.png?resizew=433)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c019153d4c8aa64811f7d5c88dbc56a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6217ba54baf35aca59d9b89ded7367e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfbc2a377c4d6c0423744c3b63409b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86478cd5c501f99f4e5b1ac9b6b0fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50533b3e373b4eb8398948404c1f6fd.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2023-10-07 22:36:36
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】两个形状、大小完全相同的含有30°和60°的三角板如图1放置,
,
与直线
重合,且三角板
,三角板
均可以绕点P逆时针旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/7c1fb9f9-3afd-430b-8edb-1f05f128e9de.png?resizew=540)
(1)试说明
.
(2)如图2,若三角板
保持不动,三角板
绕点P逆时针旋转一定角度后,
平分
,
平分
,求
的度数.
(3)如图3,在图1的基础上,若三角板
开始绕点P逆时针旋转,转速为3°/秒,同时三角板
绕点P逆时针旋转,转速为2°/秒,当
旋转到与
第一次重合时,两三角板都停止转动.在旋转过程中,
是否为定值?若是,请求出定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/7c1fb9f9-3afd-430b-8edb-1f05f128e9de.png?resizew=540)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e5570e6cac94018e08e6573942b3d3.png)
(2)如图2,若三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
(3)如图3,在图1的基础上,若三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5291ef828fea7db0a0c298b87288a1b8.png)
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|
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【推荐2】如图,将直角三角板OMN的直角顶点O放在直线AB上,射线OC平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/4ab36059-f34b-463d-b963-32960b599220.png?resizew=141)
(1)当
时,求
的度数;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/4ab36059-f34b-463d-b963-32960b599220.png?resizew=141)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd98ca37454de0fb62a445dd2ae0978a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588abe296d53dbbce91d0c693322bf8c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf49226425b648241be1c063b3d2df51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
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|
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(0.65)
名校
【推荐1】(1)如图1,已知AB∥CD,∠ABC=60°,可得∠BCD= 度;
(2)如图2,在(1)的条件下,如果CM平分∠BCD,则∠BCM= 度;
(3)如图3,在(1)(2)的条件下,如果CN⊥CM,则∠BCN= 度;
(4)尝试解决下面问题:如图4,AB∥CD,∠B=40°,CN是∠BCE的平分线,CN⊥CM,求∠BCM的度数.
(2)如图2,在(1)的条件下,如果CM平分∠BCD,则∠BCM= 度;
(3)如图3,在(1)(2)的条件下,如果CN⊥CM,则∠BCN= 度;
(4)尝试解决下面问题:如图4,AB∥CD,∠B=40°,CN是∠BCE的平分线,CN⊥CM,求∠BCM的度数.
![](https://img.xkw.com/dksih/QBM/2021/8/3/2777961659785216/2781789333569536/STEM/066670a85ccf4462b4f6c9309d8407c9.png?resizew=519)
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解答题-作图题
|
适中
(0.65)
【推荐2】某数学兴趣小组探究命题“两边分别平行的两个角相等”是否是真命题,甲同学认为该命题是真命题,并作图如图1所示,已知
,
,
与
交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/5de8c150-7f01-4fcf-8083-9c607ff3cd5d.png?resizew=368)
(1)根据甲同学的作图及题设,求证:
;
(2)乙同学对甲同学的判断提出质疑,认为该命题不一定成立,是假命题,并作图如图2所示,题设与甲同学相同,得到
,根据乙同学的作图,试判断
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499c1138294ecfbb0fd556802e08f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d281b4badcec970161c0cdc6263d421f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/5de8c150-7f01-4fcf-8083-9c607ff3cd5d.png?resizew=368)
(1)根据甲同学的作图及题设,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
(2)乙同学对甲同学的判断提出质疑,认为该命题不一定成立,是假命题,并作图如图2所示,题设与甲同学相同,得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520d831f0b99a1698f06775cc2047390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
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解答题-证明题
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名校
【推荐1】如图,在
中,
.
(1)如图①,求证:
;
(2)如图②,当点
在
的延长线上时,
交
的延长线于点
,求证:
;
(3)在(2)的条件下,若点
为线段
上一点,过点
作
于点
,连接
,且
,
,延长
,
交于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/9d417489-9f35-4d6a-accc-f2ef32ea453f.png?resizew=503)
(1)如图①,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
(2)如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7196c1a1c3ad2961253c1bc55fde679e.png)
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/5ce1335e489c2b0835d7e16ea765e1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999ab3d801f8d24ff152e32ce018f2bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3902cad5433896afe630e3729a627df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb7bd07a67c093955321b7e0e645e87.png)
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【推荐2】已知
分别与⊙O相切于点A,B,
,C为⊙O上一点.
(1)如图①,求
的大小;
(2)如图②,
为⊙O的直径,
与
相交于点D.若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb630ea75318626934df0b44e40e7ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1999ff617e28e419ade73aa8552770.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/3abc68b6-8328-495a-b03b-8e053b5a80a1.png?resizew=341)
(1)如图①,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b664f3a011a2f1f31c66a2635c5367c.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52cfbb76d96d15b26db5dc205901739e.png)
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