如图,点
在线段
上,
,
,
,
交
于点
.
(1)尺规作图:过点
作线段
的垂线交
于点
.(基本作图,保留作图痕迹,不写作法,不下结论)
(2)求证:
(请补全证明过程).
证明:∵
,
∴
① .
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d224f4e018e4194e6be04f0e21a8a9f3.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f4c7115b59128e98f3733a3dbf1c5d.png)
∴
,
② ,
∴
,
∴
,
∴
,
∴ ③ .
∵
④ ,
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1120e471627069e78a6733af07687684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/8421da5c-c0e0-4e26-b51c-e423f1605e9d.png?resizew=177)
(1)尺规作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7531ea8fd8e77ff62db1bc16da8999d9.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064c359bafcd1841d582707419d1ac2d.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d224f4e018e4194e6be04f0e21a8a9f3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f4c7115b59128e98f3733a3dbf1c5d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d206437241d548a0dcf7c1e6606480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98de0441f089a41bd554c4640635b20.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0bed25a209446077f4061d91858a59.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417eda93a175b955ebbf44e1b4998a3a.png)
∴ ③ .
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7531ea8fd8e77ff62db1bc16da8999d9.png)
更新时间:2023-07-04 13:07:36
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】新知学习,若一条线段把一个平面图形分成面积相等的两部分,我们把这条段线作该平面图形的二分线解决问题:
(1)①三角形的中线、高线、角平分线中,一定是三角形的二分线的是_______
②如图1,已知△ABC中,AD是BC边上的中线,点E,F分别在AB,DC上,连接EF,与AD交于点G,若
则EF_____(填“是”或“不是”)△ABC的一条二分线.并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/11a5120a-02bc-48a3-87ab-81ad8b839457.png?resizew=183)
(2)如图2,四边形ABCD中,CD平行于AB,点G是AD的中点,射线CG交射线BA于点E,取EB的中点F,连接CF.求证:CF是四边形ABCD的二分线.
(1)①三角形的中线、高线、角平分线中,一定是三角形的二分线的是_______
②如图1,已知△ABC中,AD是BC边上的中线,点E,F分别在AB,DC上,连接EF,与AD交于点G,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585ac3ec3fb4072c9eea28e8567702bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/11a5120a-02bc-48a3-87ab-81ad8b839457.png?resizew=183)
(2)如图2,四边形ABCD中,CD平行于AB,点G是AD的中点,射线CG交射线BA于点E,取EB的中点F,连接CF.求证:CF是四边形ABCD的二分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/72aeb7e5-105b-4ce7-bd8c-4032dda334e7.png?resizew=192)
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解答题-问答题
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【推荐2】如图,在
中,
,
分别平分
和
,过点
作
,分别交边
于点
和点
,如果
的周长等于14,
的周长等于9,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e03b41f223a73fff1e1f61c004ee0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae1210a744ae636419de68a525faf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知:正方形
中,对角线
与
交于O点,点E为线段
上一点,连接
,将线段
绕点A逆时针旋转
得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/65969624-eb4f-46f7-9f2b-a801c6af7e56.png?resizew=132)
(1)求证:
;
(2)猜想
、
、
之间的数量关系,并证明.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/65969624-eb4f-46f7-9f2b-a801c6af7e56.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afedac49ce38f25e0a73e579133afe5a.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-证明题
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适中
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【推荐2】在如图所示的三角形纸片
中,
,
(如图虚线表示折痕):
①折叠三角形纸片
,使点
与点
重合;
②将折叠后的纸片再沿
折叠.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/6a649450-67c2-40ff-9bd2-e79490f38318.png?resizew=132)
(1)由步骤①可以得到哪些等量关系?试写出三个结论.
(2)请证明
;
(3)按照这种方法能否将任意一个直角三角形分成三个全等的小三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241465bb8b380fc37d46763241c92e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3ee061bc43b327214ea7981a25137c.png)
①折叠三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②将折叠后的纸片再沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/6a649450-67c2-40ff-9bd2-e79490f38318.png?resizew=132)
(1)由步骤①可以得到哪些等量关系?试写出三个结论.
(2)请证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f7bdee35a2082d1e4ad0a968a8c41d.png)
(3)按照这种方法能否将任意一个直角三角形分成三个全等的小三角形?请说明理由.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
.
边上找一点
,使
;(尺规作图,保留作图痕迹,不要求写作法和证明)
(2)在(1)的条件下,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0feaa75e38c8ad4924c277489ad7c3.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】下面是小文设计的“过圆外一点作圆的切线”的作图过程.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986921767010304/2988849021689856/STEM/9c4713f84d064aee8c1ee1e77cd54f22.png?resizew=195)
已知:
和圆外一点P.
求作:过点P的
的切线.
作法:①连接
;作
的垂直平分线与
交于点M;②以
半径作
,交
于点A,B;③作直线
;
所以直线
为
的切线.
请利用尺规作图补全小文的作图过程,并完成下面的证明.
证明:连接
.
∵
为
的直径,
∴
__________=__________
(__________)(填推理的依据).
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f134b41f939a07722cb4278a958267e7.png)
∵
为
半径,
∴直线
为
的切线.(__________)(填推理的依据).
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986921767010304/2988849021689856/STEM/9c4713f84d064aee8c1ee1e77cd54f22.png?resizew=195)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求作:过点P的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
作法:①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
所以直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
请利用尺规作图补全小文的作图过程,并完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a5e484dfef494d27bc35ae7b8cf75d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4c311b6eb24fa85b994aab2cff003e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f134b41f939a07722cb4278a958267e7.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a5e484dfef494d27bc35ae7b8cf75d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,直线
与直线
交于点
,直线
与x轴交于点
,点C从点O出发沿
向终点B运动,速度为每秒1个单位,同时点D从点B出发以同样的速度沿
向终点O运动,作
轴,交折线
于点M,作
轴,交折线
于点N,设运动时间为t.
的表达式;
(2)在点C、点D运动过程中,当点M、N分别在
,
上时,求证:四边形
是矩形.
(3)点P是平面内一点,在点C的运动过程中,问是否存在以点P、O、A、C为顶点的四边形是菱形,若存在,请直接写出点P的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbd9335aabcd39a767ef58181c68c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f774f8a340c533ee29a03f31fb85f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f515842db016eaea3d3f1e0e9418aea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe081d6ebf87252095eeeb79334f0a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f037cf514f9f12ec2f7ad6eb409856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b5c50f862d14d11bae71261011cf97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd0548c7537cf97391837dca19348cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)在点C、点D运动过程中,当点M、N分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71390cb3c4201197fd165d2befec792.png)
(3)点P是平面内一点,在点C的运动过程中,问是否存在以点P、O、A、C为顶点的四边形是菱形,若存在,请直接写出点P的坐标,若不存在,请说明理由.
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,射线OP平分∠MON,在射线OM,ON上分别截取线段OA,OB,使OA=OB,在射线OP上任取一点D,连接AD,BD.易得:AD=BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/f8747ffd-89bd-4d63-8102-744ea67e7329.png?resizew=555)
(1)如图2,在Rt△ABC中,∠ACB=90°,∠A=60°,CD平分∠ACB.求证:BC=AC+AD;
(2)如图3,在四边形ABDE中,AB=10,DE=2,C为BD边中点.若AC平分∠BAE,EC平分∠AED,∠ACE=120°,求AE的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/f8747ffd-89bd-4d63-8102-744ea67e7329.png?resizew=555)
(1)如图2,在Rt△ABC中,∠ACB=90°,∠A=60°,CD平分∠ACB.求证:BC=AC+AD;
(2)如图3,在四边形ABDE中,AB=10,DE=2,C为BD边中点.若AC平分∠BAE,EC平分∠AED,∠ACE=120°,求AE的值.
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