在下列特殊四边形中,图
、图
、图
分别为菱形、正方形和直角梯形,请按下列要求解决问题.
中作出两条直线,使它们将菱形面积四等分;
(2)请在图
中作出两条直线,其中一条要经过点
使它们将正方形的面积四等分;
(3)在图
直角梯形
中,
,
,
,
,
,点
是
的中点,试探究在边
上是否存在一点
,使
所在直线将梯形
的面积分成相等的两部分?如若存在,求出
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(2)请在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7cc3b353b50f4d6576d6e95fec05e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
更新时间:2024-04-04 01:04:15
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相似题推荐
解答题-证明题
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名校
【推荐1】如图,在正方形ABCD中,P是对角线AC上的一点,点E在BC的延长线上,连接PB、PD、PE,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/e230eb0c-ff42-4f7b-af50-e02c8516cfe0.png?resizew=200)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4144f6ce108867d237f6891b4f4954.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/e230eb0c-ff42-4f7b-af50-e02c8516cfe0.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc646f4cc98aa4e557d044642ae316a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f1c0ba34196aa8638cbb75783ab461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8490cab76a1a6e5cb35de8535be9be.png)
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【推荐2】如图,已知
,E、F是
上两点,且
,
,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/749ebb2d-45d8-4373-9db7-f9caa22cb9b4.png?resizew=188)
(1)
.
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/749ebb2d-45d8-4373-9db7-f9caa22cb9b4.png?resizew=188)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7437ac06d7480f6c63165c26a24df6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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解答题-作图题
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【推荐1】在同一平面内,若点
与
三个顶点中的任意两个顶点连接形成的三角形都是等腰三角形,则称点
是
的巧妙点.
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123151110062080/3133545712787456/STEM/ef8b07d5449c4b178d7bcb851555531c.png?resizew=511)
(1)如图1,求作
的巧妙点
(尺规作图,不写作法,保留作图痕迹).
(2)如图2,在
中,
,
,求作
的所有巧妙点
(尺规作图,不写作法,保留作图痕迹),并直接写出
的度数是______.
(3)等边三角形的巧妙点的个数有( ).
A.2 B.6 C.10 D.12
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/12/3/3123151110062080/3133545712787456/STEM/ef8b07d5449c4b178d7bcb851555531c.png?resizew=511)
(1)如图1,求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(3)等边三角形的巧妙点的个数有( ).
A.2 B.6 C.10 D.12
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【推荐2】△ABC中,AB=AC,AB的垂直平分线DE交AB于点D,交AC于点E,如果△ABC的周长为35,△BEC的周长为20,求BC的长.
![](https://img.xkw.com/dksih/QBM/2020/9/4/2542454507208704/2543698787262464/STEM/3ca80422a6d9464e8a1fb297c724b1de.png?resizew=133)
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【推荐1】如图所示,已知等边△ABC的边长为a,P是△ABC内一点,PD∥AB,PE∥BC,PF∥AC,点D、E、F分别在BC、AC、AB上,猜想:PD+PE+PF等于多少,并证明你的猜想.
![](https://img.xkw.com/dksih/QBM/2018/12/20/2101035935195136/2103668237819904/STEM/825f2ad799d14224bfd859cf33fbe23c.png?resizew=151)
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真题
【推荐2】如图,在等边
中,
,动点
从点
出发以
的速度沿
匀速运动.动点
同时从点
出发以同样的速度沿
的延长线方向匀速运动,当点
到达点
时,点
同时停止运动.设运动时间为以
.过点
作
于
,连接
交
边于
.以
为边作平行四边形
.
(1)当
为何值时,
为直角三角形;
(2)是否存在某一时刻
,使点
在
的平分线上?若存在,求出
的值,若不存在,请说明理由;
(3)求
的长;
(4)取线段
的中点
,连接
,将
沿直线
翻折,得
,连接
,当
为何值时,
的值最小?并求出最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cf997be91eba5aa57c308a3461c799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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/e7420c2a1e8a1f0167c0d2f91bdef61c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f729a142e1fc95fe562802ca9502242.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac4a21bd60e845809b6d05c34e1df56.png)
(2)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(4)取线段
![](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/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86993d93134823c7e24e35e42aff71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb9e93edefadada7882946cfc5e5cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94dd82d1afae354ad795138fb5b6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ac8c5700ce2de9a140c4adea742168.png)
![](https://img.xkw.com/dksih/QBM/2019/7/18/2249588118732800/2249698011979776/STEM/d03db7d960a146d780783883bfa07e62.png?resizew=220)
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【推荐3】【问题情境】
如图①,在△ABC中,AB=AC,点P为边BC上的任一点,过点P作PD⊥AB,PE⊥AC,垂足分别为D、E,过点C作CF⊥AB,垂足为F.求证:PD+PE=CF.
小丽给出的提示是:如图②,连接AP,由△ABP与△ACP面积之和等于△ABC的面积可以证得:PD+PE=CF.
请根据小丽的提示进行证明.
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/1c2887d55745418296a2e99a34d7225a.png?resizew=142)
【变式探究】如图③,当点P在BC延长线上时,其余条件不变,试猜想PD、PE、CF三者之间的数量关系并证明.
【结论运用】如图④,将矩形ABCD沿EF折叠,使点D落在点B上,点C落在点C′处,点P为折痕EF上的任一点,过点P作PG⊥BE、PH⊥BC,垂足分别为G、H,若AD=8,CF=3,求PG+PH的值.
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/ea528616bb56403dbd079035af8abf3e.png?resizew=5)
小丽给出的提示是:如图②,连接AP,由△ABP与△ACP面积之和等于△ABC的面积可以证得:PD+PE=CF.
请根据小丽的提示进行证明.
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/25379ac986044ed4a5b7709c3ab09e8e.png?resizew=105)
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/984ba5ccbbe14723811ef1e063c57dac.png?resizew=104)
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/ca305c4fe45542338f189953b069423c.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/2018/5/19/1948551568326656/1949590938738688/STEM/1c2887d55745418296a2e99a34d7225a.png?resizew=142)
【变式探究】如图③,当点P在BC延长线上时,其余条件不变,试猜想PD、PE、CF三者之间的数量关系并证明.
【结论运用】如图④,将矩形ABCD沿EF折叠,使点D落在点B上,点C落在点C′处,点P为折痕EF上的任一点,过点P作PG⊥BE、PH⊥BC,垂足分别为G、H,若AD=8,CF=3,求PG+PH的值.
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