如图,AB为
的直径,AP为
的切线,F是AP上一点,过点F的直线与
交于C,D两点,与AB交于点E,连接AD,AC,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/11d3838d-4bf5-470c-a825-079489c28aad.png?resizew=167)
(1)求证:
;
(2)若
,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0105d0889f6fa9cb5430cf9e09337173.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/11d3838d-4bf5-470c-a825-079489c28aad.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8256a7aded59ef1150eb874a4eecdab0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc6d31bb070c363cc352a3648b013e9.png)
2022·河南焦作·二模 查看更多[3]
更新时间:2022-05-20 17:06:40
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相似题推荐
解答题-问答题
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【推荐1】问题背景:如图①,在四边形
中,
,
,探究线段
、
、
之间的数量关系.
小吴同学探究此问题的思路是:将
绕点D逆时针旋转90°到
处,点B、C分别落在点A、E处(如图②),易证点C、A、E在同一条直线上,并且
是等腰直角三角形,所以
,从而得出结论:
.
简单应用:
(1)在图①中,若
,
,则
__________.
(2)拓展延伸:如图③,
,
,若
,
,求
的长(用含m,n的代数式表示).
(3)如图④,
,
,点P为
的中点,若点E满足
,
,点Q为
的中点,猜想线段
与
的数量关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df030c6b405c01f6a19fd8f516325800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
小吴同学探究此问题的思路是:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccbf98ff1b1f121ee3aa3dec108ba0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fe17f698c2f4087e83ee6cc7ab01c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1227dc5c96ba08a15cb9583224eeaf1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/a08e0c79-3b6f-4588-b0d9-a407d97f9c6d.png?resizew=585)
简单应用:
(1)在图①中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
(2)拓展延伸:如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98fbb38b51b9592028d77180a661fe78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15fcde639611cd140a6ffcd336bc5e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf4c60a98e486325f3aa6216793d0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)如图④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa61d9f35c4160f319e77be88c7f033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03ca3e334c5290ab28b4b4a883c90c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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名校
【推荐2】在平面直角坐标系
中,对于已知的点P和图形W,若对图形W上任意两点M和N,都有
成立,则称图形W为点P的“关联图形”.
(1)已知点
,
.
①如图1,点C的坐标为
,则点A到线段
上的点的最短距离为_____,线段
_____(填“是”或“不是”)点A的“关联图形”;
②点Q为x轴上一个动点,若线段
是点A的“关联图形”,求点Q的横坐标
的取值范围;
(2)
的圆心为
,半径为2,直线
与x轴,y轴分别交于G,H两点,若在线段
上存在点P,使得
是点P的“关联图形”,直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2311200b822982c810beea09aa7279.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/9b5671cf-76af-44a1-a38b-41da7d233af0.png?resizew=318)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
①如图1,点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②点Q为x轴上一个动点,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c15a90db6dfd1aab79a3728748cc6c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fffad27b195220d9b31db743cd44eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
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【推荐3】如图,在平面直角坐标系中,长方形OABC的顶点A(6,0)、B(6,4),D是BC的中点,动点P从O点出发,以每秒1个单位的速度,沿着OA、AB、向终点B运动,设P点运动的时可为t秒(0<t<10).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/1f228fc9-89d6-4abc-9493-c7901e79b026.png?resizew=268)
(1)当△POD的面积等于9时,点P的坐标为 :
(2)当点P在OA上运动时,连接CP.问:是否存在某时刻t,当CP绕点P旋转时,点C能恰好落到AB的中点处?若存在,请求出t的值;若不存在,请说明理由.
(3)当t为何值时,点B关于直线PD的对称点恰好落在直线OP上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/1f228fc9-89d6-4abc-9493-c7901e79b026.png?resizew=268)
(1)当△POD的面积等于9时,点P的坐标为 :
(2)当点P在OA上运动时,连接CP.问:是否存在某时刻t,当CP绕点P旋转时,点C能恰好落到AB的中点处?若存在,请求出t的值;若不存在,请说明理由.
(3)当t为何值时,点B关于直线PD的对称点恰好落在直线OP上.
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【推荐1】如图(1)将两块全等的直角三角形纸片
和
叠放在一起,其中
,
,
,顶点D与边
的中点重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/fc43f4db-c2f9-41e7-ac69-1ff41507a5d0.png?resizew=458)
(1)若DE经过点C,
交
于点G,求证:
;
(2)求图1中重叠部分(
)的面积;
(3)合作交流:“希望”小组受问题(1)(2)的启发,将
绕点D旋转,使
交
于点H,
交
于点G,如图2,
,求重叠部分(
)的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314b5f0d19f019dbaaaf39f03bbd3340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6c2faabb08a3712336f812b0c69db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab4450854da4dff0be2408b04d21c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/fc43f4db-c2f9-41e7-ac69-1ff41507a5d0.png?resizew=458)
(1)若DE经过点C,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ccaa8033fb1fea3c67c8e78653ea7e.png)
(2)求图1中重叠部分(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5090091503f9c176630ba736fd42e67c.png)
(3)合作交流:“希望”小组受问题(1)(2)的启发,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2574c376888e766bc87b4d87d7234b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978a7a0baaa1a4e7cdac80a6a91a0ce6.png)
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【推荐2】如图1,在
中,
,D为
边上的一点,过点D作
,垂足为E,连接
,P为
中点,连接
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988455414472704/2991150888042496/STEM/5b01159d-5336-4ae3-aaa6-c2b85abd5ad2.png?resizew=561)
(1)求证:
;
(2)将图1中
绕着点A顺时针旋转如图2的位置,其他条件不变,(1)中的结论是否成立?若成立,请证明:若不成立,请说明理由;
(3)若
,
,
,在平面内,将
绕点A旋转一周,当A,C,E三点共线时,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988455414472704/2991150888042496/STEM/5b01159d-5336-4ae3-aaa6-c2b85abd5ad2.png?resizew=561)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5989e32f69a053f4042737e3d663e931.png)
(2)将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5ca998d2724107adb4ffca90da5e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
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解题方法
【推荐1】已知,如图,△ABC是等边三角形.
(1)如图1,将线段AC绕点A逆时针旋转90°,得到AD,连接BD,∠BAC的平分线交BD于点E,连接CE.
①求∠AED的度数;
②用等式表示线段AE、CE、BD之间的数量关系(直接写出结果).
(2)如图2,将线段AC绕点A顺时针旋转90°,得到AD,连接BD,∠BAC的平分线交DB的延长线于点E,连接CE.
①依题意补全图2;
②用等式表示线段AE、CE、BD之间的数量关系,并证明.
(1)如图1,将线段AC绕点A逆时针旋转90°,得到AD,连接BD,∠BAC的平分线交BD于点E,连接CE.
①求∠AED的度数;
②用等式表示线段AE、CE、BD之间的数量关系(直接写出结果).
(2)如图2,将线段AC绕点A顺时针旋转90°,得到AD,连接BD,∠BAC的平分线交DB的延长线于点E,连接CE.
①依题意补全图2;
②用等式表示线段AE、CE、BD之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2473627255848960/2475826803449856/STEM/feb89bbb083b498c8138adabccf73a7b.png?resizew=483)
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【推荐2】如图,在四边形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/67683981-dee1-4163-ab14-671516dec7a9.png?resizew=160)
(1)求证:四边形
是菱形;
(2)延长
至点
,连接
交
于点
,若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b707c3d2dcf2f53fea4ef045dd8f295.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/67683981-dee1-4163-ab14-671516dec7a9.png?resizew=160)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2ea11f04083ceea75e545382278330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eca51ab4529710dd8662ae442f608fd.png)
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【推荐3】综合与实践
问题情境
Rt△ABC和Rt△DEF如图1放置,点B与点D重合,∠ACB=∠EDF=90°,∠A=30°,AB=ED=FD=4,EF分别与AC,AB交于点N,点P,点M是AB的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799320064/STEM/2879b403-f557-4d97-b27c-09d244e4878a.png?resizew=280)
(1)数学思考
连接MN,求证:点N是EF的中点;并计算△MNP的面积;
(2)操作探究
如图2,先将△DEF沿BC的方向平移,使点D与点C重合,再沿CA的方向平移到点D为AC的中点时停止;过点C作CH
AB交DE于点H,连接AH,AN,CM.试判断四边形AMCH的形状,并说明理由;
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799320064/STEM/f9212125-5634-4584-b5de-12ac582bd90f.png?resizew=274)
(3)在图2的基础上,将△DEF绕着点D顺时针旋转30°,CH
AB仍然存在,延长CH交MN于点G,交EF于点Q,如图3.请直接写出三角形CMG的面积.
问题情境
Rt△ABC和Rt△DEF如图1放置,点B与点D重合,∠ACB=∠EDF=90°,∠A=30°,AB=ED=FD=4,EF分别与AC,AB交于点N,点P,点M是AB的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799320064/STEM/2879b403-f557-4d97-b27c-09d244e4878a.png?resizew=280)
(1)数学思考
连接MN,求证:点N是EF的中点;并计算△MNP的面积;
(2)操作探究
如图2,先将△DEF沿BC的方向平移,使点D与点C重合,再沿CA的方向平移到点D为AC的中点时停止;过点C作CH
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799320064/STEM/f9212125-5634-4584-b5de-12ac582bd90f.png?resizew=274)
(3)在图2的基础上,将△DEF绕着点D顺时针旋转30°,CH
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799320064/STEM/f0581d56-b1ff-4a10-909e-d62b198bae26.png?resizew=271)
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解答题-证明题
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【推荐1】如图,AB=16,O为AB中点,点C在线段OB上(不与点O,B重合),将OC绕点O逆时针旋转 270°后得到扇形COD,AP,BQ分别切优弧CD于点P,Q,且点P,Q在AB异侧,连接OP.
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225370138001408/2228866843803648/STEM/a0f9a64e06c54e0d9d85b29ddfcae16b.png?resizew=291)
(1)求证:AP=BQ;
(2)当BQ=
时,求
的长(结果保留
);
(3)若△APO的外心在扇形COD的内部,求OC的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225370138001408/2228866843803648/STEM/a0f9a64e06c54e0d9d85b29ddfcae16b.png?resizew=291)
(1)求证:AP=BQ;
(2)当BQ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299c366130f9b9c2f91d14387e6dde54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(3)若△APO的外心在扇形COD的内部,求OC的取值范围.
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名校
【推荐2】【感知】如图①,点A、B、P均在
上,
,则锐角
的大小为___________度.
【探究】小明遇到这样一个问题:如图②,
是等边三角形
的外接圆,点P在
上(点P不与点A、C重合),连结
、
、
.求证:
.小明发现,延长
至点E,使
,连结
,通过证明
,可推得
是等边三角形,进而得证.
下面是小明的部分证明过程:
证明:延长
至点E,使
,连结
,
∵四边形
是
的内接四边形,
∴
.
,
∴
.
∵
是等边三角形.
∴
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ced6dc2a555f64c8bbb93c4835b266.png)
请你补全余下的证明过程.
【延申】如图③,
是
的外接圆,
,
,点P在
上,且点P与点B在
的两侧,连结
、
、
.则
、
、之间满足什么关系?证明你的结论.
【应用】如图④,
是
的外接圆,
,
,点P在
上,且点P是
上一点,连结
、
、
.若
,则
的值为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/59aa59ab-6e69-4cc5-aeec-0f626dbac0cb.png?resizew=614)
【探究】小明遇到这样一个问题:如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ced5ba0c8666797d290cefca789c833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2cc1d4262a71046a0b378c250c3100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d975ef1c9eba769000881aa91f01c243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
下面是小明的部分证明过程:
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2cc1d4262a71046a0b378c250c3100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027ed57b9c6f24e27ec0ae282c76efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57961f5ba1a35ce55cf4109a623cfbf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad86c204a804754fa5048e2bb7dfdf69.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4196928df005152cf2fd03a48b378630.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ced6dc2a555f64c8bbb93c4835b266.png)
请你补全余下的证明过程.
【延申】如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
【应用】如图④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8ab594619c400a652820a840c0247d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94aa8802e272b803bd99b485b4640fcc.png)
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