如图,在矩形ABCD中,对角线AC与BD相交于点O,过点A作AE∥BD,过点D作ED∥AC,两线相交于点E.
(1)求证:AE=DE;
(2)连接BE,交AC于点F.若BE⊥ED于点E,求∠AOD的度数.
(1)求证:AE=DE;
(2)连接BE,交AC于点F.若BE⊥ED于点E,求∠AOD的度数.
![](https://img.xkw.com/dksih/QBM/2019/5/28/2213267559768064/2213608613986304/STEM/a103fc8f18934a37bb36f0d0c43322d6.png?resizew=137)
更新时间:2019-05-28 21:41:09
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解答题-问答题
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【推荐1】如图,在
中,
,
,
.分别以点A,C为圆心,
长为半径作弧,两弧交于点D(点D在
的左侧),连接
.求
的面积.
![](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/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d58197ce1f4a96b61ba684abd9f5a80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/2023/5/21/3242290646368256/3253050616545280/STEM/53a4625a5387492ab5264544030fd53e.png?resizew=193)
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解答题-证明题
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【推荐2】如图,在△ABC中,AB = AC = 4,D为BC边中点,DE⊥AB,DF⊥AC,垂足分别为点E,F.
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953759324274688/2957268486021120/STEM/605239604fc84f889daa5e6c522e41ae.png?resizew=144)
(1)求证:DE=DF;
(2)连接AD,求证:AD平分∠BAC;
(3)若∠B=60°,求BE的长.
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953759324274688/2957268486021120/STEM/605239604fc84f889daa5e6c522e41ae.png?resizew=144)
(1)求证:DE=DF;
(2)连接AD,求证:AD平分∠BAC;
(3)若∠B=60°,求BE的长.
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【推荐1】如图,在平行四边形ABCD中,点E是边BC的中点,连接AE并延长,交DC的延长线于点F,连接AC,BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e4a15f8c-242a-4725-b6e4-0ffa262e033b.png?resizew=196)
(1)求证:△ABE≌△FCE;
(2)当四边形ABFC是矩形时,若∠AEC=120°,求∠D的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/e4a15f8c-242a-4725-b6e4-0ffa262e033b.png?resizew=196)
(1)求证:△ABE≌△FCE;
(2)当四边形ABFC是矩形时,若∠AEC=120°,求∠D的度数.
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【推荐2】两个全等的直角三角形重叠放在直线l上,如图①所示,AB=6 cm,AC=10 cm,∠ABC=90°,将Rt△ABC在直线l上左右平移(如图②).
(1)求证:四边形ACFD是平行四边形.
(2)怎样移动Rt△ABC,使得四边形ACFD的面积等于△ABC的面积的一半?
(3)将Rt△ABC向左平移4 cm,求四边形DHCF的面积.
(1)求证:四边形ACFD是平行四边形.
(2)怎样移动Rt△ABC,使得四边形ACFD的面积等于△ABC的面积的一半?
(3)将Rt△ABC向左平移4 cm,求四边形DHCF的面积.
![](https://img.xkw.com/dksih/QBM/2019/7/29/2257310834065408/2258615022280704/STEM/f146156f37eb46c79037b7f6a503bfe0.png?resizew=377)
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【推荐1】四边形ABCD的对角线交于点E,且AE=EC,BE=ED,以AB为直径的半圆过点E,圆心为O.
(1)利用图1,求证:四边形ABCD是菱形;
(2)如图2,若CD的延长线与半圆相切于点F,且直径AB=8.
①△ABD的面积为_______;
②
的长为__________.
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551690240/STEM/572ba2b64cab4f6d8e36d64a9cf7f071.png?resizew=267)
(1)利用图1,求证:四边形ABCD是菱形;
(2)如图2,若CD的延长线与半圆相切于点F,且直径AB=8.
①△ABD的面积为_______;
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551690240/STEM/5144820ffc8948418b485bb9a3cc17c9.png?resizew=226)
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551690240/STEM/572ba2b64cab4f6d8e36d64a9cf7f071.png?resizew=267)
图1 图2
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解答题-证明题
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【推荐2】如图,
是
的直径,点
是
上一点,点
是
的中点,过点
作
的切线,与
、
的延长线分别交于点
、
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447114774929408/2448423496548352/STEM/9e313504-5713-43ca-8bfa-29fe0860fe76.png)
(1)求证:
.
(2)填空:
①已知
,当
_________时,
.
②连接
、
、
.当
的度数为_________时,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447114774929408/2448423496548352/STEM/9e313504-5713-43ca-8bfa-29fe0860fe76.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac559a1a89bfb16e1c44cdd7ad2f2bbd.png)
(2)填空:
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8256a7aded59ef1150eb874a4eecdab0.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dba76518a473722e04cfbac3a4333bb.png)
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解答题-作图题
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【推荐3】下面是小茜设计的“作一个已知角的平分线”的尺规作图过程.
已知:如图1,
.
求作:射线
,使得
平分
.
作法:如图2,
①在射线
上取一点
,以点
为圆心,
长为半径作弧交射线
于点
;
②分别以点
,
为圆心,
长为半径作弧,两弧相交于点
(异于点
),连接
和
;
③作射线
.
所以射线
平分
.
根据小茜设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明,并在括号内填写推理依据.
证明:∵
__________,
∴四边形
是__________(__________).
∴
平分
(__________).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/fc58b844-1ca0-4515-b41a-6d5c90acd772.png?resizew=321)
已知:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:射线
![](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/6d7b2fe01a33c4825f9974ed9663a99c.png)
作法:如图2,
①在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
③作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
所以射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
根据小茜设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明,并在括号内填写推理依据.
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbf2ad51ee93285aa3bf374852f1403.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033274547930b2e2dcd4ea4919a36738.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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