已知
中
,点
在
上,连接
,且
,
(1)如图1,求证
平分
;
(2)如图2,
分别为
上的点满足
,
,
求证:
;
若
,
,则
的周长为____________.(用含有
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0999e64863c966326150c5031f161d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0c6766bd801fa114221d0ab0bfa61.png)
(1)如图1,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ea428444b15d3c38060422a6adfaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e0288ee6f3bea38c5a539fed1a93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff981cc71e82d99f4577a1323e8e231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e267238a2ae0ecdbfed25069d15096a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78bc0078b37b3d62a59595cc7a3556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b4218f00da487d3f63b9360144708f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/40717485-ebb6-4a38-bd41-43bd7de2c5c9.png?resizew=334)
更新时间:2021-10-17 16:34:21
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相似题推荐
解答题-证明题
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【推荐1】如图,直线 AB与CD交于点F,锐角∠CDE=α,∠AFC+α=180°
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733518892728320/2737391300616192/STEM/93efab68-6cb7-41f1-af13-f3ad37c5903d.png)
(1)如图1,求证: AB// DE;
(2)如图2,α=70°,G为FB上一点,∠FDG与∠DGB的角平分线所在的直线交于点P.请补全图形并求∠DPG 的度数;
(3)若G为直线AB上一点,G不与点F重合,∠FDG与∠DGB的角平分线所在的直线交于点 P.直接写出∠DPG的度数(结果用含α的式子表示).
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733518892728320/2737391300616192/STEM/93efab68-6cb7-41f1-af13-f3ad37c5903d.png)
(1)如图1,求证: AB// DE;
(2)如图2,α=70°,G为FB上一点,∠FDG与∠DGB的角平分线所在的直线交于点P.请补全图形并求∠DPG 的度数;
(3)若G为直线AB上一点,G不与点F重合,∠FDG与∠DGB的角平分线所在的直线交于点 P.直接写出∠DPG的度数(结果用含α的式子表示).
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【推荐2】已知△ACB中,∠C=90°,以点A为中心,分别将线段AB, AC 逆时针旋转60°得到线段AD, AE,连接DE,延长DE交CB于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/ff782f26-647b-44c3-bf92-253b9eaf669e.png?resizew=248)
(1)如图1,若∠B=30°,∠CFE的度数为_________;
(2)如图2,当30°<∠B<60°时,
①依题意补全图2;
②猜想CF与AC的数量关系,并加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/ff782f26-647b-44c3-bf92-253b9eaf669e.png?resizew=248)
(1)如图1,若∠B=30°,∠CFE的度数为_________;
(2)如图2,当30°<∠B<60°时,
①依题意补全图2;
②猜想CF与AC的数量关系,并加以证明.
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【推荐1】【数学经验】三角形的中线,角平分线,高是三角形的重要线段,我们知道,三角形的3条高所在直线交于同一点.
中,
,则
的三条高所在的直线交于点 ;
②如图2,
中,
,已知两条高
,
,请你仅用一把无刻度的直尺(仅用于过任意两点作直线、连接任意两点、延长任意线段)画出
的第三条高.(不写面法,保留作图痕迹).
【综合应用】
(2)如图3,在
中,
,
平分
,过点
作
于点
.
①若
,则
;
②请写出
与
,
之间的数量关系 ;
【拓展延伸】
(3)三角形的中线将三角形分成面积相等的两部分,如果两个三角形的高相同,则他们的面积比等于对应底边的比.如图
,
是
上一点,则有
.如图
,
中,M是
上一点
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
,N是
的中点,若三角形
的面积是m,请直接写出四边形
的面积 .(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
②如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
【综合应用】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5730cb4fab6ec696f762f91c136dc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262bd138aa9aad3b0ec2f3d094bfbf0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be937cd138c3105e3e219a09277a8afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ca928bf4273b2f7a271d33ceed435b.png)
②请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb7b59666378ee2c2ca2a82d3e15b06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c79f975d766486cd369ca057413e78.png)
【拓展延伸】
(3)三角形的中线将三角形分成面积相等的两部分,如果两个三角形的高相同,则他们的面积比等于对应底边的比.如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdabd6ed0fa047e9af9bd6a38aa50050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4b2f28d1bc7089972b7b563675c4fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知
,
,
为直线
上一点,
为直线
上一点,
,设
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/cea81441-75ea-4a3b-b199-eb578f435f8a.jpg?resizew=256)
(1)如图1,若点
在线段
上,点
在线段
上,
,
,则
;
.
(2)如图2,若点
在线段
上,点
在线段
上,则
,
之间有什么关系式?说明理由.
(3)探究:当点
在线段
的延长线上,点
在线段
上,(或
在线段
的延长线上)时,是否存在不同于(2)中的
,
之间的关系式? 若存在,请直接写出这个关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224efa375375f1ac848b0c15ee51aebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f42f91374a53df6fcf8758a3450526.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/cea81441-75ea-4a3b-b199-eb578f435f8a.jpg?resizew=256)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecbc3a6fd6ae27c377842f2a6b67540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)探究:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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【推荐1】学习了全等三角形后,我们知道中点在平行线之间的题目通常会用到倍长中线构造“8”字型全等的方法,比如在图1,已知
,连结
,
交于点E,若E为
中点,则有
.请利用以上方法解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/d61268dd-543e-4fc9-8a0e-99d12a535e3c.jpg?resizew=546)
问题1:为测量河对岸A点到B点的距离,可借鉴上述方法求值:过点B画直线
,并在直线
上依次取C点和D点,使得
,
,补全图形 ,指出测量哪条线段就可知道
的长,请加以证明.
问题2:【深入思考】如图3,在
中,D是
的中点,
,
,
,试判断线段
与
的数量关系并证明.
问题3:如图4,在
中,
,D为
中点,连结
,作
交
于点E.已知
,
,则
的长______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477c9dca9fcacf53e17b43e5643d958a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/d61268dd-543e-4fc9-8a0e-99d12a535e3c.jpg?resizew=546)
问题1:为测量河对岸A点到B点的距离,可借鉴上述方法求值:过点B画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
问题2:【深入思考】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bae74865b97db7ced7fbf67303668ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3daf661e72bddd36989339e7ebccf4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad8848b88979adb3f484aef2106bc5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
问题3:如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df3f49493b1f7317cbe2e95e79338a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】如图1,
是
中
边上的高,点D是
上一点,连接
交
于点F,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/570c6663-e1db-46bc-bb73-82b8eb0ceb2c.png?resizew=349)
(1)求证:
;
(2)若
,求证:
;
(3)如图2,在(2)的条件下,延长
至点G,连接
,
,若
,
,求线段
的长.(注:不能应用等腰三角形的相关性质和判定)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea9ea546d3cf6f6e5d52d4e44d19ea0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/570c6663-e1db-46bc-bb73-82b8eb0ceb2c.png?resizew=349)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c43e0a7f676f6f3d860f12b82c8cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(3)如图2,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4bbce30719b4bb62c8a97f94e6e7a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a0f4f3ac4062f21ad6c2ba4b0ab390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】如图1,在等边三角形
中,
于
于
与
相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/617a99a0-9cd4-4eea-b28e-0126606a109a.png?resizew=428)
(1)求证:
;
(2)如图2,若点G是线段
上一点,
平分
,
,
交
所在直线于点F.求证:
.
(3)如图3,若点G是线段
上一点(不与点O重合),连接
,在
下方作
,边
交
所在直线于点F.猜想:
三条线段之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044937d7debb70e4f8eeba104acd08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068e1c1a16e257f6736f3af34ef317c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/617a99a0-9cd4-4eea-b28e-0126606a109a.png?resizew=428)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb42c0ba7ec7078702028e220d5451d3.png)
(2)如图2,若点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e93465eafe38b8ef89f90c9d3955dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883a2090ac575f032e379b7e64a623cc.png)
(3)如图3,若点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e93465eafe38b8ef89f90c9d3955dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d830db9e9acff25fe00897fd0531ab9a.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐2】【数学经验】三角形的中线,角平分线,高是三角形的重要线段,同时,我们知道,三角形的3条高所在直线交于同一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/5a39a128-23e9-4d1d-a7b5-14b0950e4af8.png?resizew=423)
(1)①如图1,
中,
,则
的三条高所在直线交于点 ;
②如图2,
中,
,已知两条高
、
,请你仅用一把无刻度的直尺(仅用于过任意两点作直线、连接任意两点、延长任意线段)画出
的第三条高.(不写画法,保留作图痕迹)
【综合应用】
(2)如图3,在
中,
,
平分
,过点
作
于点
.
①若
,
,则
;
②请写出
与
,
之间的数量关系 ,并说明理由.
【拓展延伸】
(3)三角形的中线将三角形分成面积相等的两部分,如果两个三角形的高相同,则它们的面积比等于对应底边的比.如图4,
中,
是
上一点,则有
.如图5,
中,
是
上一点,且
,
是
的中点,若
的面积是
,请直接写出四边形
的面积 .(用含
的代数式表示)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/5a39a128-23e9-4d1d-a7b5-14b0950e4af8.png?resizew=423)
(1)①如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【综合应用】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5730cb4fab6ec696f762f91c136dc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e30ffe627436f57ecf46b89c57bb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea36aae82612a5c81159ff463163b69.png)
②请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359bc7a47c723102813220ef7283177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
【拓展延伸】
(3)三角形的中线将三角形分成面积相等的两部分,如果两个三角形的高相同,则它们的面积比等于对应底边的比.如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdabd6ed0fa047e9af9bd6a38aa50050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b99a0a946fda95212b6f5b8970810c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5627dee61ff1a179ed56a7e627927448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次